LOSING WEIGHT ADVICE

HI I HAVE INSULIN RESISTANT PCOS I'VE CUT OUT SUGAR ON METFORMIN CHANGED MY DIET BUT FOR SOME STRANGE REASON I CAN'T GET THE WEIGHT OFF I'M 283 & WANT TO BE 200-210 I HAD A ED AND I DON'T WANT THAT TO BE THE WAY I LOSE WEIGHT AGAIN.....