Hi.i Am A Single Mother With 2 Kids. Parents Passes

Hi.i am a single mother with 2 kids. Parents passes away.no bros nor sisters. Working .ex husband still after me harassing and not letting me settle peacefully anywhere. Tried to remarry...but not confident as of who is good.also no one to take responsibility and help me find a life partner. I am 39 now. Very depressed...not happy..cant even play with kids.recently over eating over sleeping...easily irritated...feeling helpless...feeling very unsafe and scared to move out. Need advice.