I quit my job in December because I was incapable of getting through a day of work without yelling. I was constantly angry, tired, and my health had deteriorate

I quit my job in December because I was incapable of getting through a day of work without yelling. I was constantly angry, tired, and my health had deteriorated. I have been unemployed for 5 months. It isn't any better now. I am trying to work from home on some side projects but I am able to focus for about one hour on a task and become extremely tired. I can not even apply for work as the act of filling out a resume seems impossible. Prior to this I was a very successful IT Director with a team of 60 in 3 countries. Now the simplest tasks are impossible for me. Two years ago I would have thought this would be an inconceivable position for me end up in. I am only 39. Oh well - that's life.