It's very common that one doesn't think about CH's when in remission and when a cycle begins, it's all they perseverate on. Again, you are not alone!
At 22, you are certainly not a minor and able to make adult decisions w/o your parents input, particularly if you are not receiving empathy and support. So 22 is great news opposed to 15, when you began this living nightmare.
Depakote and Verapamil are both very common preventative meds prescribed by doctors. There are yellow tabs on the left side of your screen which would be my recommended beginner reading. i.e. Medical info, traits, o2 therapy, quiz, survey, etc.
After you do some reading, you will soon learn that 240 mg Verap is extremely low for CH treatment. Many others have shared your opinion of Depakote.
You need to understand your cycle...document your attack times, how intense the pain was, what you were doing prior to attack, how long each attack lasted, if you aborted the attack w/ something-what worked/what didn't, your daily diet, etc., etc.
Do look into something called the 123 thread which is an anti inflammatory vitamin regimen. It's all natural, very inexpensive, just taking daily vitamins, no ill side effects, no prescription required, very helpful for many who follow protocol, do yourself a favor and at least read about it and try it!
Great to read you are using o2 therapy. See the yellow tab on the left side of the screen titled "Oxygen Info" for do's and don'ts, success stories, etc. Also you might consider a NON-rebreather mask kit from the CH.com Store also a yellow tab on the left side your screen.
Ever try a Red Bull, Rockstar or your favorite energy drink at onset of an attack? It's all about the Caffeine/1000 mg Taurine combo w/ carbonation...check it out...slam one, chug it fast and see if it works for you just as you are beginning an attack. Many of us report excellent results w/ a fast abort just from chugging this carbonated energy beverage as fast as you can.
Imitrex nasal sprays are known to be more effective than Zomig nasal sprays and Imitrex injections are superior to Imitrex nasal sprays. Imitrex and Zomig pills are worthless, as they take too long to abort a CH attack. But your mom might find the pills very helpful w/ her migraines.

Do be aware of possible "rebound attacks" from Imitrex and similar tryptamine based drugs.
As helpful as it is, Prednisone is also something to be leary of, as it may stop a cycle in its tracks for several days. However the attacks usually come back w/ a vengeance once the mg dosage is tapered low. Also the long term side effects are downright cruel to the hips, knees, etc.
Melatonin, natural sleep aid, has proven helpful to many and can be purchased cheap at a vitamin shop.
Try to eat clean, stay away from your known triggers and get regular cardio exercise. Although you do need to read and learn as much as your doctor, seriously, you should also try to live between the attacks. In other words...make most use of every moment you are not in pain.

What city are you in?
Gregg in Las Vegas