HELP!

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I am 23 and I have been struggling to lose weight since I was 13 years old. I found out that I had PCOS when I was 17 and I have been struggling to find doctors educated about what it is. About a year ago I found an endocrinologist and I was put on metformin. The metformin doesn't help at all so then I was put on Victoza. Victoza helps with my weight loss but it has recently been put on the table as a possible reason for my erosive gastritis. I have tried calorie counting, paleo, natural weight loss supplements, meal replacement shakes. I also exercise often. I can lose some weight with the paleo but I hit a platform and I am no longer losing weight. I don't know what to do anymore. Please help!