It's funny how the body adjusts. At my last company (I was a director. 1 of 4) we had a MASSIVE problem with working long ours. At the end I was working 100 hour weeks (I only ever had time to eat sleep and work). I pulled the plug after a few years of these self imposed insane hours. You would assume all would be well then but what happened next was completely unexpected.

I fell ill 3 times in the following 3 months, and I was on holidays! Previously I hadn't been sick for years. After a bit of researching I discovered after a period of intense stress, it's pretty common to get sick once you remove that stress.