PCOS is ruining my life.

I have PCOS and am trying to conceive. I have gained almost 50 pounds in the last year literally doing nothing different. I did go off birth control. I've been trying so hard to get back down to a healthy BMI so that my menstrual cycles will return. Haven't had a period since June. I also have endometriosis. I have two children 9
And 7. Am 31 years old and in relatively good health except this. I've alway been very up and down on weight but always been able to drop if I did low carb. I've tried every method under the sun and seem to just keep gaining. It's a horrible cycle. Any suggestions on how to get this weight off or anyone with similar situations.