11:11,
Sorry for the delayed response, but I wanted to see if you had any other questions after reading the info that Gemma sent you? I personally use the ketamine nasal spray. Like you said, it's just one of many medications in my toolbox. I do love that it is pretty fast-acting. Within 15 minutes, I can get relief. Taking too much can make you start to hallucinate and I only decide to use it at that level when I'm having an extremely bad attack.
Like any abortive medication out there, using the nasal spray is restricted to only a certain number of days. It doesn't surprise me that your doctors aren't willing to prescribe it. I'm not sure how widely it is used and accepted for Migraine patients. I'm lucky to go to the Jefferson Headache Clinic, who is pioneering research on ketamine for Migraineurs. There honestly haven't been too many studies published yet on the effects for Migraine patients, however Jefferson is planning to publish a paper in June.
Like Gemma said, the type of doctor you see for your Migraines makes a big difference in the type of care you receive. If you're not seeing a Headache Specialist (see the links from Gemma above), there are some pain management doctors and anesthesiologists who will prescribe ketamine.
I hope this information helps, let me know if you have any questions and I'll try to get back to you quickly!
-Katie
Migraine.com Moderator