D..
You seem to have a lot on your plate. You and your mom haven't had a good relationship since this man she was living with got together. You have called yourself a walking time bomb in the past few months, are on anti-depressants, and don't get along with other family members.
What precipitated this latest blow-up? Where you trying to get your mom to listen to reason about this man who is abusive to her? Did she hit YOU because she can't hit HIM?
You need to ask yourself what part you played in this fiasco. Don't bother to tell us. We aren't up in your head. If you cannot be honest with yourself about who has the blame here (and maybe it really IS all your mom, we don't know here) then you cannot fix things.
If your medical doctor is the one giving you anti-depressants, ask for a psychiatrist so you can get help straightening your thinking out. When you learn what triggers are happening, then you can learn how to manage them.
You need to come to terms with how you will live with or without your family. You need help to do that. Make sure that you get it.
I know this isn't a "get a laugh" post. I can't think of anything that I could say about this sad and truthfully, alarming, post. So this is meant to be advise instead.
Good luck,
Dawn