Weight loss advice?

So I’ve recently been diagnosed with PCOS, and within the last 6 months or so, I’ve put on about 20 lbs without changing my diet/exercise/etc. About 3 months ago I started noticing the weight gain and tried everything to stop it- supplements, healthier diet, exercise, fasting, you name it. Nothing has worked. Right now I’m trying to start the keto diet, but I’m a little unsure about it. Has anyone had any success with it? I’m also thinking about talking to my primary care doctor about starting a weight loss drug because I am that desperate. Any tips or tricks would be greatly appreciated!!