What Treatment Is Suggested To Control Weight Due To Possible Occurrence Of Diabetes?

Hi, for the past few years I ve been feeling down a lot, over tired and generally flat. I have 4 cysts on my thyroid which I get checked every year but apparently they are not dangerous & my thyroid is working fine . I am in a good relationship with 2 gorgeous kids & I work 4 days per week. I know being a working Mum is hard work but it feels like more than that. I am very emotional, I never used to be like this, I cry at almost everything slightly sad, I can t seem to control it. I don t know if it has anything to do with it but all of this has been since I had my tubes tied in early 2011. My periods are now very different to what they were pre op. They are very light, almost non existent and the pain is much better (not complaining about that!) however, about 1-2 weeks before I am due I crave chocolate really badly. am extremely thirsty & become extremely irritable. I have never experienced any of these symptoms previously. I find myself lashing out at the kids for barely nothing & feel bad instantly but in the heat of the moment am unable to control myself. I am overweight, I ve been trying to lose weight for years now but just can t seem to get on the right track even though I know what to do. I comfort eat, I deserve it etc. I have been told if I don t change my ways I will get diabetes. Could this be the cause of all my issues? Thank you for listening :)