I have been asked about this, so I have pulled it up AGAIN for all the newbies ..I sure hope it helps ya!!!
ChuckPart A
I think it is time to repost oxygen (O2) tips and information. Most of this has been posted before, but I have included other information and links, all into one post, part A, and part B. BTW, I am NOT a doctor, nor a respiratory therapist. I am just a clusterhead who has listened, read, and tried various methods, and found some that work, for me.
If you don’t have a non-rebreathing mask The nose canula CAN work, if used this way: Do not put it in your nose. Put it in your mouth, close your lips around it, and inhale. Open your mouth to exhale, and then close your lips, again, around it to inhale. Breath only through your mouth. Do not inhale any “room air” only the O2.
If you can’t get a moisturizer Make your own. Take an empty (and cleaned) mayonnaise jar (or something like that), drill two small holes in the lid, the size of the O2 air line. Cut your hose, a foot or so from where it hooks to the tank. Stick the hose from the tank into the lid, and far enough down so that it touches the bottom of the jar. Take the hose that goes to the mask, and stick it into the other hole, but just far enough to stick through the lid. Seal around both hoses with a silicon type sealant. Put an inch or two of water into the jar. No more than ¼ full! I attached mine to the tank with a bungee cord. BTW, if you put ice cubes into the water, it will cool the O2 somewhat. Many feel this helps it to work.
To buy your own bubbler go here: Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

(Thank you, Mr Happy)
If you are using a non-rebreathing mask I hold the mask to my face with my right hand. I hold it firmly to my face with the palm of my hand. When I inhale, my index finger goes over and covers the holes on the left side of the mask (the ones with the rubber valve over them), this is to make sure the valve seals fully. I place my thumb over the holes on the right side of the mask (the ones without the valve on them). I use my right hand, so that my thumb covers the holes on the right side. My thumb is larger than my fingers, so it does cover the holes completely. When I exhale, I just lift the finger and thumb (keeping the mask to my face by the palm of my hand), and let the air out of those holes. Some people tape over them. It works better for me, the way I describe it, as you don’t have to lift the mask, when you exhale.
When and how long to use the O2 Grab the O2 as SOON as you feel it coming on. Speed is the name of the game. The sooner you get on the O2, the better the success rate. Stay on it for 15 to 20 minutes. If it has not killed the hit, stop using it. Bear through 10 minutes without the O2, and then hit it again. If the O2 does not work the first time, the second time is almost always the charm for me. Something about that 10 minute break seems to do it, for me.
You don’t need to stay on it for the full 20 minutes, if it stops the hit well before that time. BUT, stay on it for 5 minutes AFTER the last of the pain is gone. The first and last place I have pain is just above my cheek bone, at my temple. I press my finger into that spot, and if I still feel some pain, I stay on the O2.
Trial and error will let you know what works best for you.
If O2 does not or stopped working for you Try it again. I have gone through periods where it did not work at all. There have been other periods, where it only worked about 20% of the time. Keep trying it. Even if it only works a few of the times, those are hits that you did not have to take imitrex or suffer though a full hit. It has far fewer side effects than any other medication. It is worth it to keep trying.
(continued, below)