I have had squamous cell carcinoma 3 times in the base of the tongue and right lymph nodes. I have been in remission for 5 years now, I have for the last year been experiencing times of imbalance, confusion, tender scalp, skin like scales on my head I can peel off, joints tender in my body, jaws bone hurts, neck pain, muscle cramping in my neck and tongue. MRI (normal), CT (normal), Neurologist doesnt know what is wrong. I want a PET scan and no one will do it. Can I demand one? Could this be symptoms of cancer coming back and they are over looking something?