Been using O2 for about 5 months and is the only thing that aborts headaches for me (about 75% effective).

Only very recently have I tried hyperventilate technique and it does seem to work faster and definitely uses less O2 but need some help on technique.

I have been trying Batch's technique of standing up, 10 breaths in 30 seconds (more or less) with forceful exhale then full then inhale of O2 and hold for 30 seconds.  What I am having trouble with is relaxing.

Between watching the clock/watch, standing, forceful exhale (requires a lot of effort and concentration) holding for 30 seconds, bracing against the wall or holding on the the valve of my M tank when lightheaded I find it hard to relax while doing all this.  The forceful exhale in particular is the opposite of relaxing.

After about 5 minutes I have then switched to full breaths of O2 with forceful exhale but not the 10 in 30 without O2.  Do this for about 3 or 4 minutes then a 10 minute break and usually need another session.

So how do you relax and are there any other techniques I should try?

I have not been particularly successful in aborting at first sign usually need to be deeper into headache for success.

I do not have typical cluster headaches (been diagnosed as atypical chronic cluster whatever that means) after many years of migraine diagnosis.  Triptans are like poison for me they work then I get a week or 2 of even more frequent headaches and often really bad ones.  When I get a full blown headache that does not abort it can often last 12-18 hours at full pain for the last 6 hours or so.  They always start off slow and build and can't tell the difference between   
the ones that escalate to horrible or the ones that are relatively mild and don't last too long (3 or 4 hours in my case).  In a typical month I might have 5 to 10 headache free days give or take.

I have no idea what my triggers are if indeed I have triggers but alcohol is usually but not always a trigger.

My D3 levels are high right near the top of the safe range, my crp test results (measure of inflammation) are off the charts low (which is good).

Taking 600mg (240 morning 360 evening) of verapamil for last few months and it has helped but not enough.

So any tips?

I definitely have allergies although I have had them my whole left and only developed headaches I the last 13 years.  Are you suggesting the benadry ltwice a day for a period of time or permanently?

Any other O2 tips/ suggestions to what I described?

Stan,
This may sound strange, but i just cured my last 3 CHs by using the Wim Hof method. And I am so grateful, I just had to share with the CH community. I saw the words "hyperventilate", and "o2" in your post so I thought you might benefit like me. Though Wim has probably never heard of CH, his method allows you to tap into, and control your hypothalamus. So i put 2 and 2 together and tried it when i felt a CH coming on. My life has just changed. here's the jist of it. from his website. it works for me.

1) Get comfortable
Sit in a meditation posture, whatever is most comfortable for you. Make sure you can expand your lungs freely without feeling any constriction. It is recommended to do this practice right after waking up since your stomach is still empty or before any meal.

2) 30 Power Breaths
Imagine you’re blowing up a balloon. Inhale through the nose or mouth and exhale through the mouth in short but powerful bursts. Keep a steady pace and use your midriff fully. Close your eyes and do this around 30 times or until you feel your body is saturated with oxygen. Symptoms could be light-headedness, tingling sensations in the body, electrical surges of energy.

3) The Hold, retention after exhalation
After the the 30 rapid succession of breath cycles, draw the breath in once more and fill the lungs to maximum capacity without using any force. Then let the air out and hold for as long as you can without force. Hold the breath until you experience the gasp reflex.

4) Recovery Breath
Inhale to full capacity. Feel your chest expanding. When you are at full capacity, hold the breath once more for around 15 seconds. Relax the body deeper as you move further inward, let everything go. Your body knows better than you do. After 15 seconds you have completed the first round. Repeat this for about 4 rounds.

Summary
- +-30 times balloon blowing
- Breathe in fully
- Breath out without force and hold until gasp reflex
- Inhale fully and hold for 10-15 seconds.
- Repeat until finished 

Bonus Power-ups
Add push-ups or yoga poses during the time you are holding your breath until you wait for the gasp reflex. Notice that you are stronger without air than you would normally be if you could breathe!

Cold Exposure
After the  body scan of the previous exercise you are ready let your body embrace the cold. It is very important to try to relax as much as you can, really be with the cold, only then can your body process the signals and start thermogenesis. As Wim says, “the cold is your warm friend!"

Cold Showers
If you are new to cold exposure, just end your warm shower with 15 - 30 seconds with cold water only. Begin with your feet and then follow with your legs, your stomach, shoulders, neck and back.. An initial shock, shivering and hyperventilation is normal. Try to remain calm and breathe easily. Close your eyes and really try to embrace the cold. Dont poor the cold water over the head if you are not known with cold exposure. If you feel any strong physical uncomfortableness, like heavy shivering, numbness or pain, get your body warm again as soon as possible. Cold exposure works like weight lifting, you get stronger over time. There are little muscles around your veins that contract when they get into contact with the cold. After some time (only 1-2 weeks according to Wim) these become stronger, making your veins healthier and reducing the force that your heart has to use to pump blood around your body. You can increase exposure over time. At one point the cold will feel just as comfortable as wearing your favorite pajamas and you can skip the warm shower completely. Notice how you feel amazing after a cold shower and sluggish after a warm one.