My cancer was on my lateral tongue (the mobile part). I had a painful canker sore for a few months, and while the sore may have been there for a while, I didn't always notice the pain. I first went to my family doctor, who referred me to an oral surgeon who did a biopsy in the office. When the biopsy confirmed I had cancer, he then referred me to an ENT who did the surgery (hospital, but as an out-patient!).

Based on where you said the lesion is (back near tonsil), I would go to an ENT rather than an oral surgeon. An ENT should be able to scope your throat with an instrument during your office visit to get a better look. A biopsy would be needed and I'm not sure that could be done in the office based on the location. As Christine said, look for an ENT who is familiar with oral cancer.

Take it a step at a time and a day at a time. Right now you don't know what is wrong and the first step is to find that out. Hopefully it is not cancer and easily curable. If it is cancer, you are already ahead of the game in that you already found OCF, the best source of information and support!

Wishing you the best!