I was wondering why you 2 still live in the same house? This is obviously making you very unhappy, and I'm assuming if these trips can be taken you can afford your own place. Why not be " gone " when she gets back. You don't need to be in the same house to check in from time to time to make sure she's doing ok. She keeps leaving anyway, so why not start living for you now?
You had mentioned your father in law lives with you. Maybe he can give you updates. Also, maybe ask a lawyer what the best course of action is in order to get custody of the baby when he or she is born.
Just hate the thought of you living there with her, and what it's doing to you. Don't let it turn you into something your not.
