Feeling unattractive

Feeling down tonight! I used to be able to eat whatever I want whenever I want and I no longer can. I can feel my metabolism slowing down. I just turned 31 over the summer and that isn't that old but in my mind I feel like I'm getting old and fat. I have always had self esteem problems and I feel like they are getting worse. I don't feel pretty or attractive and on top of it my fiance and I are trying to get pregnant and have truly been struggling. I go to my OB tomorrow to see what he say. I am feeling pretty emotional about this all. Normally I don't get emotional unless my fiance and I are disagreeing but tonight in thinking of this I wanted to cry.. what is wrong with me?!?! Guess I just needed to vent.