I get bouts of this even after 20yrs of taking metformin.
I stop the med then reintroduce one tablet for a week, then 2 tablets for a week and see how my symptoms are. Then increase eventually to 4tablets daily until I can tolerate it.
Only long-term use gives me the hormonal benefit I get from metformin. Which I need. Diabetes is just another health problem that benefits from metformin to me.
I use metformin for pcos and weight loss.