When do menopause starts?

I am 46 years old and my last period was on november 7 2010. I have been regular my entire life always coming with cramps and the other stuff...Would I have been reaching the menopause state. Also my eating habits are irregulars more junk less healthy stuff, always anxious always want to eat something and worst I'm now growing a fat belly my average weight is 115-125 I'm now 137 lb. I cut my Fallopian tubes when I was 25 so is not pregnancy and also I am not active. Should I see a Dr. Periods annoy me but now I am worried.