So sorry to hear this Mary Sending tons of strength and support your way!
I don't know if it helps at all, but when it comes to serious stuff like this, it has helped me in the past to think of steps like this as being a kind of temporary, sort of "wait and see" situation.
When I ended my last long-term relationship, I moved out thinking I was just leaving for a few days (or even a couple of weeks) to sort of get my bearings and figure out what to do next. I wasn't thinking it was 'the end' just yet - just that I needed to get out of the situation and take it from there. In retrospect, it wasn't until I left and had been gone for several weeks that I realized I was doing the right thing.
Having said this, I realize I don't know a thing about your particular situation - but I wanted to say that it's helpful to *not* think about the big picture (just yet) and scare yourself too much. It might be just a matter of needing to get out of the situation so that you can hear yourself think, so to speak. Very hard to make big decisions when 'in' the situation - at least that's been true in my experience.
A scary thing, but so courageous.
In the meantime - sending over a giant stack of your favourite magazines, some seriously good dark chocolate, some calming tea and a set of really nice bedsheets. Any pampering that you can do will help a *whole* lot. Here's hoping you can spend lots of time with good friends to help ease the stress of it all.
Thinking of you, and hoping it all works out for the best.