It sounds like you are really panicking and I don't want to add to it, but I must clarify something. Cancer in its early stages might be characterized by lack of pain, but my daughter has stage 4 tongue cancer and now a recurrence, and her first symptom was pain in her ear, then pain when swallowing. She had no visible lesions, spots or lumps, just pain. GO TO ANOTHER ENT. Get a second opinion. If there is actually a visible lump there, request, no, DEMAND a biopsy.
It probably is NOT cancer, but you need to find out. And you need to do it soon. If you feel this doctor is not addressing the issue sufficently, find another. Find a head and neck surgeon or ENT that specializes in cancer.
Best of luck to you.
Rainbows & hugs,
Rosie