Self care is important. Sleep is tough for me too. When you are low on sleep just keep in mind that is a poor time to talk to your H. Even if you want to, do your best to avoid communicating when you are overly tired.
Sounds like you might be in the dark as to what is really going on?? Why do you think H left and now says he's done?
As far as how this works - I'm new too. What I do is journal on my own thread when there is something on my mind. I recommend also going to other threads to look for similar situations to find out what works and what doesn't.