Quelmath please up your game on the oxygen. Try the method CHf mentioned. Do not get hung up on the lpm. I "pussyfooted" around this for a while with marginal results. For me the rapid oxygenation of bloodstream was what helped me to kill attacks(sometimes in 5 minutes) work best and staying on 5 minutes after relief of pain to prolong next attack. Oxygen is the best abortive but it won't stop the cycle, there is plenty of info here on how to do that. PF and good luck to you.