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...old saying...Dr B i believe: if you are not sure a med is working...it's not! but, when you say "cans" it sounds like that faddish and worthless "Boost". you need at least 15 lpm, a proper non rebreather mask, and a breathing technique that works for you. at best an O2 abort takes 5-8 mins...a boost can gives less than 1. you ALREADY got the breathing technique which is a highly effective one for many and the type advocated by the expert on O2. get thee some tanks (not a concentrator) for pure oxygen. and to paraphrase @CHfather, if the O2 doesnt work its one more diagnostic clue to rule out CH. it sounds to me that either you have a very odd type of CH or one of the others he mentions.. best jon

shaydaymayday, I don't know anything about pepcid, but thanks for posting. I'm sure many people know a lot more than me that might be able to duplicate your test. Cheers, J