Too much Imitrex can cause rebounds and failures. Too much oxygen does not. Used properly for CH, I stop 97% of my attacks with oxygen alone, with above 15lpm. We all do whatever it takes to stop the pain. I've had CH for 30 yrs,. Oxygen has helped 29 of those. When I first used o2 it stopped 50-60% of my attacks. More is better with o2.
I told my Neurologist, if I could only have one CH treatment, it would be oxygen. Minimum 15lpm with a Cluster Headache mask. With a bag.. I now use a
demand valve. Like a fighter pilot mask, lets o2 out only when I inhale. Not cheap. I can got almost equal results with a 40lpm regulator and a 3 litre cluster mask.
You will find what helps you best. Doctors are behind the curve, so we must know more than they do. Take charge of our condition and treatments.