Sorry to hear you've been injured, and I hope you're mending well in the meantime.
But the stress at home can't be helping. You don't mention if your BIL's move-in is permanent or temporary... if it's temporary, I think I'd try to ride it out for the sake of family peace. But if it's permanent, or past its appointed end-time, then, well....
It seems unfair that your wife would choose her brother's needs over her husband's... but was there a very compelling reason for him to move in or was it simply convenience? Is there a way you could help him on his way without seeming to be trying to get rid of him? (such as helping him job-search or find an affordable place to live) I think if you approached your wife from the point of view of wanting your own space in the house, now that you're housebound particularly, it would be more likely to work and less likely to offend, then simply wanting him to move out because you don't like him.
Have you reminded her of your original bargain that he should go away when you are at home? And as you're home all the time, now, well, there he goes (theoretically, I know).
There's also the matter of your health... could your doctor speak up for you in this situation? If you ask your BIL to just move out, he could be offended, but if you approach him by saying that the doctor insists you have privacy and quiet during your recuperation, he should bow out gracefully.
You mentioned that you weren't very plainspoken about not wanting him to move in, in the first place. Perhaps your wife also isn't aware of how much of an impact BIL is having on your marriage? Have you told her in plain words how he makes you feel about her?
Sorry to ask so many questions, and sorry also that you seem to be at such a low point! Do you have a neutral third party to speak to about this, for advice and perhaps to simply get things off your chest? Just talking helps us deal with things sometimes.
I wish I could say something more helpful than just "good luck", but well...
Good luck!!
