Hi,
I've been on 2000mg of Metformin, twice a day for several years, before I started my current regime, when my blood sugar reading was 42.0 and supposed to have been enough to kill me - too tough for that. I felt fine.
On my current regime, I take 1000mg Metformin morning and 1000mg Metformin at night although my Diabetes Doctor has suggested that I can increase my Metformin tablets up to 2000mg twice a day (what I was on before), however, so far, that has not been necessary.
You can read more of my diet, below, as I see each post I make goes to the top of this page and I've written quite a lot.
You might also check out my suggestions for the flu and the Coronavirus Pandemic and a possible cure.
Since I've not had Coronavirus and don't expect to catch it, I can't say my cure won't work any more than I can say with confidence that it will.
Still, nothing ventured nothing gained and it is always a good idea to have a fall back plan against whatever the future might hold and how you deal with it.
Best Wishes