When I was going thru my separation and then divorce, there were times that the only way we communicated was via email. I found a few good recovery friends who would help me... I would write what I really wanted to say - venting, mostly - and I could send to them instead of to him. My sponsor often told me to go back in and delete all of the adjectives and make it just the facts. (She usually said that to me in her best Joe Friday voice - give us the facts ma'am, just the facts...)
She was also really good at reading his responses back to me: blah blah blah, pick them up at 8, blah blah blah no money, blah blah blah lawyer.
Remembering this makes me laugh, though you might find that hard to believe. I am so incredibly grateful for the life I have today, and for what great young men my sons have turned out to be.
There is light and life on the other side of this, THAT I can promise you.