My W moved out over a month ago and said she needed space to figure out how she feels. Recently i was told that she wants to go forward with the divorce and says there is no turning back.
I am in a similar situation as you. It is hard to focus on anything and when I find any small opening of light it quickly gets covered over by thoughts of negativity and a ton of anxiety. I find talking to friends and family helps, but doesn't take care of the problem. The only way I find mental sanity at the moment is to just get up and out of the house and "try" to do things that I enjoy in life. This is extremely hard since joy is a difficult feeling to deal with when you feel hurt and lost.
For me this is like learning to walk again... One step at a time until I am fully in control of my body and mind.