Weight loss

Anyone have any tiles for weight loss with PCOS?! I just got diagnosed last week and have been on my Metformin for a week. I've been trying to lose weight since December. Actually I've been trying to lose weight since I was in highschool, but never could get any off. Then I got with my ex when I was 19 and from 19-22 I gained 70 lbs from that relationship and I really need to get it off. Please help! I just need some tips. I currently weigh 270 and I'd like to be 160, but my doctor said he'd be happy with 200. I'm still working out a little mostly just lifting trying to tighten things up. Thank you!