We are in a very similar sitch. However, while my W is just completely non-confrontational about things, I think your W is a bit meaner, if you'll pardon me saying so. Did she really say: "I want you to get the f out of the house as soon as possible"? Did she really drop the F-bomb? That is not very classy. And she has no right to demand it of you.
I though of some practical advice that may help you detach while you are under the same roof: It seems like your W is tormenting you with her 'subject-less' emails. I agree with Mr. Bond (would have to be crazy not to) that it is NOT about you. Nevertheless you are experiencing a LOT of spew from her. My thought was: perhaps you can configure your email software to receive her emails directly into a separate folder. The Trash folder would be ideal, but that is probably not practical at this point . Perhaps you can have a folder called "spew", and rather than seeing an endless flow or trickle of tormenting spews all day, you could check the folder once a day, when you are mentally and emotionally prepared for it. Just a thought.
Hang in there. We share your pain, so you don't have to shoulder it all yourself.