HOLY CHIT!!!! CgarDan, I had the same thing happen about a month ago. No shit! It was a "tinny" or metal taste right on the tip of my tongue. It lasted for about a week to ten days, and then gone. Now, I will say I had a slight bit of sinus-type pressure in my head (not prone to seasonal allergies) and a slight (slight) sore throat.
Hell, I'm old and shit breaks down, so I didn't go to the doc. Ain't no sense in it. Since then, I haven't experienced again, and I had never had it happen before. Things that make ya go, Hmmmmmmm!
I'm glad someone else has encountered it. Wish ya well, brother!
Floyd T