Nerve damage or nerve inflammation from muscle tension over the nerve might explain some of your symptoms. If the regular doctors are stumped, it might be time to ask for a referral to a musculo-skeletal specialist, or even a physiotherapist. Your local licensed Naturopathic doctor might have some ideas.
I hope this helps. Christopher Maloney, Naturopathic Doctor Augusta, Maine www.maloneymedical.com Individualized research available for a fee. Informational only, I cannot treat or diagnose via the web.