Do I need a therapist?

I am young ( over 18 of course )and a single mother. I'm ADD and was on anti depressants from 14-19 years of age. I realized I get angry very quick and always about to snap. I feel as tho if I'm not angry I am completely depressed. It's never in-between. Most of my issues went away when my child was born but within the last year I feel as tho my depression an anger has come back in full if not fuller effect than before. My parents are divorced and absolutely dislike each other. When they both are around I am the parent trying to keep them both civil. I've always been stuck in the middle of their verbal and physical abuse threw out my entire life. I haven't had the best upbringings but certainy not the worst. But I've noticed a lot of my childhood nightmares are starting to take over my dreams. So I try not to sleep much. I try to explain this to my mother and she tells me just to deal with it , this is life. You have good days and bad. I certainly have more bad days than good. I see this starting to effect my child and I want him to have the best life possible. But obviously my state of mind isn't healthy. My family doctor told me to just simply write all my problems down and it will help. I asked about seeking mental health therapist but never got a real answer from him. So question is will therapy help with this or should keep jotting this stupid bs on paper. And think I'm crazy everyday.