I got covid in 2020 and was wiped (like most folks) but my energy never returned. Finally got a blood test for it and my thyroid was just cooked, off the scales bad numbers. Had to start taking synthetic and it’s still at a point of finding the right levels. After a lifetime of perfect tests showing great blood work including thyroid i’m dealing with problems on weight and energy. Had your levels checked?
Honestly, a lot of people are missing the excercise component in their diets.You should get 30-60 mins of good excercise to improve circulation. But if im not mistaken, dont do it directly after taking metformin
You may need to start eating again, your body may be resenting the caloric restriction and is nuking your metabolism.
Give yourself a few days of normal, clean, but abundant (not excessive)eating, then fast again.