Since you haven't had a period for 2 years, that means that you haven't ovulated for 2 years. So it's not likely that you'll get pregnant naturally, unless you could lose significant weight.
Polycystic ovary syndrome is noted by a failure of ovulation, which it seems that you have. There are pills that your doctor can prescribe that will help you to ovulate. Once you ovulate, you will most likely get pregnant. Best wishes.
Polycystic ovaries (PCOS) is a common reason for no ovulation. I don't think there is any reason (or much likelihood) for finding another reason.
It's usually fixable by medication, as I said.