What is the minimum weight required for gastric sleeve surgery?

I am 72.4 kg. I should be between 50-54kg for my height of 162 cm and ovarian health. I have yo yo dieted and lost and gained lost and gained some more. It's beyond frustrating. I have PCOS and I want to have a baby. I'm tired of dieting and want to make a change that is more permanent. Are there any doctors who would agree for me to have a gastric sleeve or suitable alternative? I don't have an eating disorder and a psychological test will attest to that.