Not sure this is of help but only time I recall was last June when prescribed Trimethoprim for UTI. Started a few days after I started a 7 day course and lasted about ten days after last pill.. seems like a mild issue compared to other things but it was odd and seemed like everything I ate tasted the same; the taste was sort of like a copper penny and seemed to go up my nose and was 24/7. (I also feel I got a vision issue after first few pills... still have, but no proof it was meds). When it happened I checked internet and it said could last a short or long time, was thankful when got normal "taste" back. Hope you do too.

I had the taste intermittently during the day and worse during day. I heard something about zinc deficiency but I do take supplements.
Hope it does not go on forever
Burt