"He said something like, "What, are you going to carry an O2 tank with you everywhere you go?" Maybe!) "
That's not a good sign....a competent "headache doc" knows FULL well that O2 is the FIRST therapy choice......comparatively inexpensive, rapid action, minimal, if any, side effects....
I "carried" an e-tank in my car, had an e-tank in my office, and of course a nice little rack of e-tanks (later an M or two) at home. A couple of internet purchased $25 regulators and a clustermask or two and I was GOOD TO GO>>>>>>>
Best
Jon