Start doing research on Metformin. MY legs are very painful. I Googled it and found many Metformin users are blaming Metformin. I’m sure you won’t find any big studies blaming Metformin or they would take it off the market. There are anecdotal stories of people switching drugs and gaining strength in their legs.
Your legs are painful as in cramps?
If so...I have been taking magnesium and cramps have disappeared.