I am devastated and can barely function. Crying daily, shaking with fear and panicking about the future.
DGB, you are going to be OK. Really, you will. Much of my initial reaction was fear-based, so I listed all the things I was fearful about and tried to address them. Afraid of being lonely? Get out there and GAL. Afraid of finances? Start to take a good hard look at what your assets, income, and expenses are. Afraid of the legal process? See a L to find out how you'd fare if it became necessary. I have seen two. Are there other things? There are ways to deal with them. Fear can keep you in the corner if you don't face it head on.
Do you need to be home when your H comes over to see D? Try going somewhere instead, even if it's an errand. That avoids the scene when he leaves.
Read lots of threads here on the boards. You'll find some that seem uncannily similar to yours. You'll find some that you'll kiss the ground you are not experiencing. Both will help you.
Post a lot and you'll get good input from wise people (I'm not one of them! Ha!)
Reading DB/DR is, of course, critical.
But above all, please believe that you will, in fact, be OK.