I had a similar exprerienc a long time ago. I noticed it in the shower when I was washing my hair that me scalp felt tingly. Then my cheek and mouth started to hurt. Then my face started to droop and my arm and hand got tingly. The doctor sent me to the dentist in case I had some kind of dental problem. The next day my doctor called me and told me he thought I had a stone in my salvia duct So he put me on a 3 day strong antibiotic. What ever it was that cured it. He said if it was a stone I might not even feel it come out, and I never did. What ever, I never had that problem again.