Martin,
I hate to take this to the serious side but I had the same symptom last fall. To cut a long story short, my doctor dug in and determined I was battling depression. Flyfishing was one giant way I'd historically re-energized my batteries and I'd lost all interest in it and other outlets. He prescribed 4-8 weeks of time away from phone, computer, work and he forced me to be "reintroduced" to fishing and family. As crazy as it sounds, it was not easy to do for the first two or three weeks. Soon the interest and energy returned. Family life and work life came back in balance and the passion is back....for all things! I'm not suggesting this is happening to you but the "what's happening to me" topic title caught my attention. I do apologize if this is an over reaction but I'm not taking a chance...
Grassman