Have you looked into the following possibilities:
MS
Candida
Bell's Palsy
Guillaume Beret Syndrome
I have also known people with all of these conditions - surprisingly, they all felt dizziness and facial tingling!
I know someone with MS, the mainstream rx for MS is awful, but he has gotten a lot of relief by dealing with Candida.
Oh - have you considered seeing a Chinese herbalist, too? I once had a terrible sore throat cured by a couple cups of chrysanthemum tea that a Chinese friend said her herbalist had given her. This was after my western dr had told me there was nothing to do and that I might have to go to the hospital for dehydration!
I know how frustrating it is when you can't figure out the underlying cause of discomfort. Best wishes to you and your boyfriend. I hope you find a successful treatment plan soon!
Hang in there!