Glumetza

I have been having digestive issues with metformin (I currently take 2x500mg tablets per day.. I was mistaken in an earlier post, I thought it was only 250...)

My doc recommended trying glumetza which is slow release, 1000mg taken around dinner once per day. I've been giving it a try for a week so far, but I find the morning and day after each dose is horrible - muscles are burning and devoid of any energy whatsoever. I'm also brutally tired all day.

Is that just adjustment issues? I thought Glumetza was essentially just a slow release metformin.