"I want to punch him until he fights back."
I find that an intriguing (and very sad) admission. What is it about these rages you have that makes you feel that you need him to fight back? If he did hit you in retaliation, how would that make you feel? Vindicated? Noticed? Important to him?
The reason I ask this is that what you wrote in your OP reminds me very strongly of my (aggressive, occasionally violent) ex. I often got the feeling that her aggression was, at least in part, an attempt to goad me into an aggressive response. I'm not an aggressive person so my passiveness seemed to drive her into ever more extreme attempts to provoke a reaction. Which is where the violence came in.
In my ex's case I suspect that this behaviour was rooted in her upbringing. As far as I can tell, her parents had a very stormy relationship and I think she (subconsciously) tries to mirror that. I wonder if she felt that rage equals passion equals love.
I also suspect that her anger was sometimes an attention-seeking thing. If she wasn't getting the attention she thought she deserved by being nice, then she'd try to get it by being horrible.
To answer your final question of why you should get help for this: at the moment your abuse and violence is directed at one person. But as with all abuse, it's not the victim's fault. The violence comes from within you. If you don't find out what's fuelling your abusiveness, and learn better ways of dealing with it, then you are very likely to end up acting in the same way in any future relationships you have. Also, if your DCs see and/or hear you being violent towards their father then it will be very damaging for them.