Great advice from F'T' and Freud. OXYGEN can't be overemphasized. It's the real lifesaver. If you can't get a prescription, you can do as many do and create your own system using welding oxygen.
For most people with CH who have done the vitamin D3 regimen, it has been effective at stopping cycles, reducing severity of attacks, and preventing future cycles (though not right away -- it can take a few weeks, although for a small number of people it's faster). http://www.vitamindwiki.com/tiki-download_wiki_attachment.php?attId=7708
Often, a good doctor (and I would say emphatically that you do not have one, given what was prescribed to you) might use a steroid taper (prednisone, usually). In some cases, it will stop a cycle, but in most cases it gives pain relief for a few days before the cycle comes back as you are tapering off the steroid. You can use those few days to jump start the D3 regimen, or to use the commonly prescribed preventive, verapamil, which takes time to get into your system enough to be effective.
Regarding "busting" with shrooms or seeds (or L S D), read the numbered files in the ClusterBuster Files section of the board. You might find other things that will help you as you read the other files in that section. The "triggers" document, for example, has been helpful to some people.
Also, because CH is often flared up by allergies, even ones you don't know you have, consider taking Benadryl 4 times a day, 25 mg 3 times, and then 50 mg at night. It's a lot, but it can help. Some people find that melatonin at night, starting at about 9mg and working up as needed, helps. Melatonin is an important chemical (hormone??) that is low in people with CH. NOT recommended to take both Benadryl and melatonin at night.