To be honest, you shouldn't have to live that way and this is entirely intrusive. First, I do agree that one step could be what Bill said above but at the same time, I'm wondering what it is you actually see in her.

The wording of your post, is very negative and I am not saying anything bad about how you have done so but analyzing what it means and what it says about your feelings toward her. The only thing I see pointing to why you're still with her is that leaving "is not an option" due to the lease. That's really not a strong enough option to remain in a relationship. The fact that you even mention it is kind of alluding to the fact that you know that it's something to consider though. Which speaks volumes to the unmentioned problems in your relationship here.

On top of that you are at the point of feeling like you're gonna snap. You state you don't want to snap which tells me that you're at that point and trying to avoid it. That too speaks volumes to your relationship with her aside from just her intrusiveness here.

She sounds very controlling and manipulative and pretty much no one likes to live with someone like that, let alone be in a romantic relationship with them.

You won't like my advice but the only thing that may not be an option is "physically leaving". I admit I don't know all of what you're going through and this is all just my analysis of your words but I do feel that you're very unhappy in this relationship and if I'm right, either drastic relationship changes need to happen or you need to move on.