Can you tell your doctor what you need prescribed?

I haven't been ovulating for over a year. It's made me gain 40lbs+, gain anxiety, unable to conceive and periods that very in length 35+ days. My doctor put me on Clomid for a month which worked! I'm back to ME! My husband just deployed and I'm no longer TTC. I think Metoformin could help me, but I'm unsure if it's okay to ask the dr for this.