Re: Been Told To Move Out...
From what you describe it does sound as she may be suffering from post-partum depression. She is probably overwhelmed with the changes to her life. She seems to do not many of the things she used to do. Part of the problem may be the constant interruptions of her sleep, and a lack of sleep can certainly be emotionally draining. Some babies are really crybabies, whilst others are a lot easier. If your first child is a crybaby then it can be really overwhelming for a first time mother to deal with one.
Moving out would not address these issues at all. She may think it is you, but it is probably the situation - she has little control over when the baby cries, when it needs to be fed, defecate and all that.
At the same time, because she spends 24/7 close to the baby, she may feel only the best is good enough, and that she is the best. Perhaps she suffers from a need to make life perfect for the baby? That would explain why she may be more homebound than she should have been, or why you can't do anything right in her eyes. However, it is completely unrealistic, and bound to result in more anger and frustration. As strange as it sounds she needs to spend some time away from your child.
Keep on talking. Ask her what kind of "sane time" she wants. Suggest to her that she go out on an evening, and you'll look after your son. I am not sure if there is any family close-by, but it might be a good idea to let grandma & grandpa babysit on an evening (I fear she'd be too wary for other babysitting options), so you can spend the time together.
Things will get better.
The butterfly counts not months but moments, and has time enough. - Rabindranath Tagore
Keep true to the dreams of your youth. - Friedrich Schiller
The only philosophy which can be responsibly practised in face of despair is the attempt to contemplate all things as they would present themselves from the standpoint of redemption. - Theodor Adorno