Tough decision Martin, but it sounds like it was necessary.
During the first half of my career I spent a huge amount of time "on the job" at work even though I was off-shift. I found that this "volenteer work" was not appreciated and over time I really reduced the amount I provided.
With my new found free-time about 3 years ago I became an instructor with the local youth group that my children are enrolled in. This activity has it's share of responsibility and commitment, but I am much happier than I was before.
I recall an often used quote that, "A change is as good as a rest"; sure was in my case.
Good Luck in finding your next passion.
Mike