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You can get oxygen prescribed by a competent doctor (which means maybe there's a 30% chance of getting it, maybe up to 60 or 70 percent if you provide them with the info and you're persistent). Lots of people get welding oxygen from a welding supply store and order a mask and regulator over the internet. Initial cost might be $200-$300, depending on a lot of factors (size of tank(s); quality of mask; rent or buy tanks; local market); only cost after that is tank refills. If you want specifics, just ask.

You're self Diagnosed I presume? Potter

I have had 3 Occipital Nerve Blocks and 3 more under Fluoroscopy via the method Bejeeber here mentions. I had no success with it relieving my chronic daily migraines (7-10 a day) and it didn't help with the episodic clusters I had at the time. I am now chronic and considering the SPG block, SPG implants, and Vagus Nerve stimulation.