At 79, I have been diagnosed as Type II diabetic for 12 years or more.
Recently, in late December my labs indicated a precipitous A1c drop from 6.5 to 5.1 an all time low. I was taken off metformin. I began taking my fasting blood sugar in the morning and for 10 days it was less than a hundred. In recent years it was in the range of say 135 which is less than the former 140 type II threshold.
Type II diabetes is in my experience a disease of lab numbers. The original diagnosis was made on the basis of blood sugar of 140 in two 6 month tests. There are no real symptoms.
What happened? I have no clue
Metformin has some ability to actually lengthen human life beyond the normal average, which may mean it actively helps repair or augment healthy processes. It just seems you used that extra time to get a few more things in place to help get you back to normal.
Congratulations, Bert!