The others are right. You have to do whatever is necessary to take care of yourself and the child. Jail and police are probably an appropriate step. I would also suggest stashing some money and car keys and maybe a change of clothes, so if you have to get out of the house in a hurry, you can do so. One of the other moms has said she kept stuff in the trunk of her car so she could just get in and GO.
This is such a difficult time. I hope that you can wrap your son up and hand him to his Higher Power. Sounds like he has a difficult journey ahead of him
HUGS
Osier59