Thomas, I had a terrible time with retirement as well. Used to mostly talk for a living, but breathing and voice problems forced me to stop. It was almost missionary work dealing indirectly with kids. Have finally after more than 2 years managed to shift my thinking. However, the feeling you get from contributing has led me to a community project (converting a school cafeteria into a community theater venue. Have to go at it slowly, a little at a time, but it will likely still be there for a few years after I'm gone and may be as helpful to some other kid as theater was for me way back then.
We Type As find it hard to slow down and stop for awhile, but at least we survive heart attacks better than our more easygoing friends. I must admit, however, that I've just about mastered the nap.
The more I do, the less I accomplish.