Often the colon is enflamed and enlarged. my husband's developed loops. This was discovered when he had surgery for a burst appendix. When the colon has twists in it, the procedure you are talking about has more risks, such as punctures. I hate that my husband has to take metformin. It is a really nasty medication.
Please refrain from triple posting the same question. No one monitors this forum on a minute by minute basis. We are patients like yourself who volunteer our time helping others when time permits.
"I've been takingMetformin for years will the side effect of diarreha go away?"
Years? Not by now unless your dose and/or regimen changes. Your doctor should have been made aware a few days after your diarrhea began.
"Should I be concerned when it's time to have a colonostomy"
Try asking your doctor how you should prepare. Is your spelling correct? Colonoscopy is an exam using a camera. Colonostomy is major surgery involving abdomens, intestines, holes and plastic bags that need changing periodically.