Oxycontin is highly addictive and is not an ideal maintenance medication for a patient with chronic pain. If indeed an extensive workup has been done to evaluate you for true TIA's such as with MRI, carotid US, and cardiac studies and everything has come back normal, then it's quite possible that the symptoms are directly due to the effects of the oxycontin. In the last 10 years, there have been many new, more aggressive therapies for headache that do not resort to narcotic use. Intravenous depakote, steroids, DHE, magnesium, intramuscular injections with lidocaine and similar type meds and now even botox injections have been effective in some headache patients. Some of those things have been around and some have just emerged in the last year or two (botox). New oral medications are also available like topomax (topamax) or lamictal, both of which are seizure meds that have been found to have some activity against pain. ANd of course, the triptan medications like Zomig or Imitrex. I understand that you are looking for help. Try a pain management program or a headache clinic. If you are in the area, Drs. Mays, Stillman, and Gretter are excellent headache specialists here at the Cleveland Clinic. ANd if you need more agressive management, we have a pain clinic associated with the psychiatry department. Good luck.