Hi,
Firstly look at the side effects of your medication, then check Autonomic neuropathies. Have you tried an antihistamine to help the throat. It has helped me when the throat starts constricting from Dysautonomia or I have a mild anaphylactic reaction. It tends to relax my throat muscles for a short period, giving some relief.
Many things can cause various symptoms so similar it takes someone willing to spend the time to work through the issues with you. So keep pushing for answers until you are satisfied.
Cheers