Hi.This happened to me a few years ago.Mine started with a metalic taste in my mouth and then I lost my taste on one side of my tongue,after which my lip went numb and one side of my face.I panicked thought I had a stroke.
I saw the doctor and he diagnosed BELLS PALSY,which is to do with the nerves.I was lucky because my face didnt droop,but it was all numb for about two weeks.I was treated with steroids to.
I would see another gp and get a second opinion, or go back and see him.Some people get bells palsy worse than others.(IM NOT SAYING THATS WHAT YOU HAVE)
The feeling does return,its a virus.