It sounds like you are in a very dangerous situation. I know it is not easy, but you have to think about your child and make that child priority number 1.
Can your mom send you money to leave? How could you even work in this type of environment? Forget the apartment, tell the landlord you need to leave.
My suggestion is LEAVE! A shelter for battered women or a place where he will never find you. He will most likely not change and meth is a spiral to hell and he will take you all down into it, if you allow it. Do this for you and your child.
I speak from experience, I left my abusive spouse when my child was two and I had no family supports or help from friends, so it is possible.
PM me if you like.