Wanting to leave

I'm asking other divorced moms out there.

I'm 27 my son is is 18 months. Lately my husband has been terrible to live with I'm 18 hours away from any friends or family.

My husband does work and I am stay at home but thats all he does to contribute to this family. He doesn't spend time with me or my son he hasn't changed a diaper since our son was a new born, I havnt had a night out or any outing with out the baby, he doesn't bath the baby, dress the baby, or get up with the baby ever. He rarely spends time with him and when he does he just sits him on his lap when he games then dumps him out side the room and closes the door when he gets "difficult". He doesn't spend time with me when I talk to him he won't reply or even look at me he constantly has head phones in to ignore me or in on the stupid video games if he does talk to me it's to yell at me and call me stupid. I was yelled at today for almost making eggs in a pan instead of a pot ( who makes eggs in a pot) that was this morning he has yet to speak to me. All he does is play video games and get high. Then after ignoring me comes to bed expecting sex. But if we're around any one at all acts like worlds best dad and husband.

I want to leave but I don't want to lose any custody of my son I'm scared to. As he already does nothing with him I don't trust him to co parent. I'm also scared he would leave out son alone with his mother who is a Addict. As I havnt been abused I don't know how to obtain custody I don't know if I'd be able to move me and my son back home (where my family is) so we would have support to get on our feet. What would you do what do you think I should.