.....are there any holes in the mask? tape 'em/plug 'em....you want pure O2 with no room air mix...
....make sure flow is high enough for bag to refill for next breath....you don't want to be waiting...
...some find breathing directly from tube better...just be sure no nose breathing while using mouth tube...
....downing an energy shot (2 oz/5-hr energy type quick, easy, no sugar) on the way to tank enhanced effectiveness immensely for me....
...absolutely critical to start O2 immediately upon perception of hit...stay on after for as long as it took to abort...if i waited or could not get to tank quick enough there was a point where no amount of O2 would work. since it is best to avoid triptans as only a last resort abort, learning your hit "tells" is vital. is not always obvious to the clusterhead as many report that others around them can see a hit coming before they do....weird but true.
....hyperventilation (some start even before getting to O2 tank) is reported best method....others (me) find slow DEEP breaths just as effective with added benefit of calming effect....another is breathe and hold. try various methods to see which works best....a combination worked best for me (slow/deep/hold..repeat), sometimes within same hits..
...no, reliable sources of medical/welding O2 will not give you "bad oxygen"....note that scuba tanks are compressed air, not O2 on the off chance this is what you're using...
...schedule changes are poison to clusterheads....a sadly limiting factor for many....i had to maintain very specific routines...especially sleep and eating (low blood sugar a trigger)...