Welcome, LauraLynn, sorry to for the difficult situation that brings you here. You have been offered great advice from members so I just wanted to add my welcome to you.
I know you don't think it now but you are enormously better off without this person. You will need to break the Trauma Bond you are in with him which is painful but once broken you will feel a lot better.
Please focus on yourself and your son. If your son grows up in that environment you are setting him up in the same cycle as you are in. It can stop with you, you can save him from going through it.