Ladies, when you get ready to start*?

Do you literally go crazy on food?.. a few days before I start and during .. I consume more food than a 700 lb man!!.. this is contributing to my current weight gain of 2008..im usually about 120... now im 140 give or take.. and this is crazy.. it just started happening about 7 months ago.. i had the usual cravings before but recently.. its just pop and chips and cookies and cheese and fast food.. just going and going.. and i don't get full one bit or sick surprisingly.. maybe I'm depressed on top of it?? I can't take this anymore.. is there a medical condition to this.. I mean besides fat Azz b*tch lol.. on normal days I eat light.. i don't eat breakfast.. I just eat like once a day.. is there medicine I can take??