I believe the way Metformin works, it doesn't directly lower blood sugar..it increases insulin sensitivity...which I think means you should be able to take it even if hypoglycemic. Considering it's not very expensive, do you have access to it off label? I bring this up since I found many diabetics and at least one MD thought the branded version was better than generic. Diabetics are able/required to know how well their treatment is working on a daily basis
But I see it's adjuvant, probably a very long range trial.