My scope, CAT scan, and X-ray, and FNB were all inconclusive. You said your doctors told you there was nothing to worry about right? That is a big difference, my doctors never told me not to worry, they just never mentioned cancer but couldn't figure out what was going on (although infected lymph node was mentioned a few times in the beginning) until the surgery for the frozen biopsy, which is exactly why I had that surgery, if they could have figured out what was going on before I would not have had the surgery.
As far as tonsil cancer being more obvious, I wouldn't know, 4 doctors looked in my throat and it was never mentioned until the surgeon opened me up.
I'm not a doctor, I don't know. I think I was just trying to say keep pushing until you get an answer. Perhaps them saying it nothing to worry about is answer enough.
I have been seeing on this site that certain dentist screen for oral cancer. My mother said hers does and its my understanding that it is a light they can shine in your mouth (someone please correct me if I am wrong).
I know after this whole ordeal I will be finding a dentist that screens for OC and I won't go to one that doesn't. Maybe that is something you could look into to help put your mind at rest.