I'm inserting some genuine encouragement <here>.
Wow, that is beyond nightmarish indeed about your current bout, but first, kudos to your doc for the suggestion to check us out, and second, lots of people have gotten a significant amount of control over the migraine and CH, so there is real hope you can too. For starters:
If you happen to be in the US, many here will go for cheap welding O2 (which is the same stuff), for an O2 affordability workaround
You'll notice some unlikely seeming, but now about as long proven as you can get (while awaiting completion of large scale scale scientific studies), preventives used successfully by legions of CH'ers, and starting to be adopted by migraine folk. Namely the D3 regimen and busting, which play well together. That "New Users - Please Read Here First" Blue Banner at the top of the page contains starter busting info.
If you're not seeing a lot of responses on this very new migraine side of the Forum, we can move, or copy your post over to the long established cluster side, especially since you unfortunately straddle both.