I've read all I need to read TMC, get out of there. If your SiL is coming and going in YOUR house without your permission, and you don't get along, you need to change that. Get your own place where you are in control of your surroundings.

Have you talked to your parents? Are they nearby where they can help out with the baby? Can you move in with them temporarily until you find something?

I feel for you, you're going through a terrible time right now. So far you have been doing really well, keep it up. Feel good about how well you've been doing, and what a great mother you've been.

You will get through this and you will be stronger.

Accuray

Married 18, Together 20, Now Divorced
M: 48, W: 50, D: 18, S: 16, D: 12
Bomb Dropped (EA, D): 7/13/11
Start Reconcile: 8/15/11
Bomb Dropped (EA, D): 5/1/2014 (Divorced)
In a New Relationship: 3/2015