Jen you are strong enough.
I have been riding the rollercoaster for nearly 17months and I still have good days and bad days.
When I have bad days I try and remind myself that at least I have a diagnosis. My sister has the dreaded "unexplained infertility" and it meant for her that she questioned everything including her relationship. We have the benefit of knowing what is causing our infertility and being able to find ways to treat it.
By the way my sister now has 12month old twin boys thanks to IVF (1st attempt) so they too are a reminder for me that I can get there.
I am not on metformin so can't help you directly with those queries. Hope this helps and remember you are not alone.