I see you posted in the dental forum which is what I was going to suggest .
wonder if any of the doctors mentioned or thought of t.n. ??
you have seen a few different types of docs and dentists. I wish I could have an answer but i honestly dont know .
keep us updated .I am sure as the days pass the answers will come. I only have a strange taste in my mouth because of the steel plates and leads I have. others have an odd taste from meds they are on. so I really dont know.
Low pain to you. keep searching the answers will come.
PEACE
BMW