I advise you not to go to hospitals and other places to lose weight. I am also a dieter. My experience in losing weight is that I don't eat at night and don't eat fruit. You can eat more tomatoes in summer and more apples in winter, which is exactly what girls like to eat. At least I think it works!
Then you can drink oolong tea or Pu 'er tea to lose weight. I tried oolong tea last year and it worked well. I bought Pu 'er tea recently, and Pu 'er tea doesn't taste bitter. I heard it's degreasing! Also, I tried to drink honey water and white vinegar (3: 1), which are also good drinks to lose weight.
I only have 48 kilograms now! You can try my experience.
I hope it can help you lose weight.