Metformin questions

I’m only on 500mg, and I’m a lean pcos. I’m doing a diet change, exercise as well as taking metformin.

I’ve noticed though this large bloat. My stomach is bigger than normal. Like there’s a lot of gas or water retention.

The last few days I’ve taken this med I have been fine. Until today I just feel completely tired, nauseas, don’t want to eat. I didntwant to eat the first day I took it either. I took it after breakfast, ate lunch, then fidnt eat again till 11pm which is highly unusual for me.

Is this normal? What are your experiences with metformin for pcos?