Depression

I have an almost 2 year old, hitting terrible twos. I am 16w1d and weigh 140lbs (I'm 5' ft so I'm definitely over wieght) my fiancé lacks the romance or sweetness. He just slaps my ass or grabs my boobs. My life isn't bad at all, but anyone who has had or has depression knows it isn't how bad your life is, that causes it. I don't know what to do, I just want to disappear..