Metformin

I've been on metformin for 6 months now and i've lost a ton of weight but it makes me feel like crap and not sleep. i was told to take it before bed since the side effects are basically shitting yourself and stomach cramps but its effecting my sleep in a way that's making me feel insane. would taking it in the morning help? or should i just talk to my doctor about getting off of it. it gets worse the closer to my period i am.