Candida can be really painful. I ahd a bad case a few months ago and my pain levels went through the roof. Does the mouthwash you have have Nystatin in it? If so, it should help get it under control (you can also get lozenges you can suck on to help control it).

As for the pain relief, a medical oncologist should be able to find a pain medication, or combo. of medications, that works for you. Migraine pain is pretty different from the pain you have now, though, and you might find that Celebrex helps more than you might think it would. Still I would definitely go to the oncologist, who should be used to treating some very severe pain, and also should be aware that pain meds don't usually cause addiction when they're used to treat this sort of pain.

Good luck.

Nelie