I'm A Female, 17, And I Am 5'3". I Go

I'm a female, 17, and I am 5'3". I go to a weight doctor and I'm still not losing weight. I was 163 when I started a month ago and now I am 171. I kinda have been down lately for no reason. Every time they give me a vitamin shot, but I don't know what else to do. I take aderole for my ADHD so there isn't much I can take. A diet isn't helping at all and I want to know what can I do and/or take to start losing weight.