On and off sore throat near collarbone on left side, sometimes dull tooth ache, unsure if related. feels like mucus there. could it be thyroid?

See PCP: this should be evaluated asap. It may not be your throat at all.

Unrelated problems: Since these issues are unrelated you should address each separately. See your PCP for sore throat evaluation and your dentist for tooth pain. Good luck.

See your MD: Your description of the problem is a bit vague. Many times a sore throat can cause a lymph node to become tender. At other times a tooth problem may cause a sore throat and tender lymph node. I suggest seeing your MD to further evaluate and refer you accordingly. Good luck,