Famous? Or infamous?
My ears didn't ring, and my throat didn't really "hurt"- it often felt tired, as if I'd been talking all day. Now, I'm still technically recovering from surgery, and my laryngeal nerves were moved around. My voice is a little husky at times, and my throat still feels "tired" at times. Oh, and I can't really sing or yell. I've been told that it's temporary.
It really sounds like your doctor is looking everywhere for an answer. Hopefully, this new round of tests will give you the answers you need.
DDD (4 levels- L2-3 thru L5-S1), Hashimoto's Disease