Just a small thought about this. As tank pressure levels get lower (as you have used more of the O2 in the tank), there comes a point for many people when O2 loses its effectiveness. Our solution has been to switch to a new tank, but turning up the lpm rate on your regulator, if you're able to do that, can also have a positive effect.
I am on 25mg TID for 10 days, if no improvement/minimal improvement I will bump up to 50mg TID. I am currently on DHE intranasal as a new abortive. I have also heard of octreotide... haven't explored that option yet. Yes, I am on PPI currently but with 25mgs taken with food I don't know if I would need a PPI long term (they have long-term use risks of their own). No drinking alcohol is huge! (I gave up alcohol anyways.. it's my biggest trigger).