GG, Your h's empathy chip is broken and right now, it's all about him. You can't rely on him to be the man he once was. If you need help, then I would start looking for someone to help out around there. Maybe he is hoping you'll ask him to return home, but I wouldn't want him in the shape he's in right now. If you think you've got anxiety and stress now, it would be far worse w/him there 24/7.
It's going to take a while for your h to move through his crisis and there is nothing that is going to change that. If you find a way to "snatch" him back to reality, well...later on he will have another crisis to finish up the current one and it will be far worse.
Learn to save yourself first. You can't do anything about your relationship or him for the time being. I know you want him home and back into you life full time, but he's got to finish up his crisis first. You can't fix him...he has to do that.
Take care of yourself...that's the number one priority. Your body has been telling you it needs rest and changes in your life. Today is a new day, start your search for some help, even if it's part time, it's a step in the right direction.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.