This patient support community is for discussions relating to PCOS including anxiety, baldness or thinning hair, high blood pressure, high cholesterol, depression, type 2 diabetes, genetics, heart problems, increased hair growth (hirsuitism), infertility, menstruation (periods), obesity, ovarian cysts, pelvic pain, pregnancy, skin problems, sleep disorders, and weight gain.
I think your doctor's plan sounds rational. You should work as hard as possible in the meantime at losing weight. You may not get down to 'target' but any weight loss will help both you and your chances of having a healthy safe pregnancy. Between now and March you could lose 10-15lbs.
As you lose weight, your chances of conceiving naturally will increase. You still have 5 - 10 years of childbearing opportunity ahead of you, presumably you don't want more than 2 - 3 children, so there is still time... so focus on getting and staying healthy. If you do get pregnant and have the baby then managing your weight so you can look after and enjoy your child is also critical.
If you had no side effects from metformin at 1000 mg, likely no problem even at a higher dose. But given that your periods have returned to regular on 1000 mg I would reckon that the dose you are on now is suitable.
Have you tried something like weight watcher's? There are also on line diet supports groups for free.
All is just my personal opinion. Best wishes
Sally