Overtraing is overtraining, and it sounds like you've got some of the classic symptoms. I know when I first realized I had allowed this to happen to myself I was reluctant to really believe it - this happens to 'athletes' not to average people like me is what ran around my head.

The best way to tell for sure is to take a week or 10 days off from all workouts and catch up on some rest. If you go back to working out and it's enjoyable again and you notice that you're stronger you know you were overtrainging. I've come to realize that simply shortchanging myself on sleep is enough to push me over the edge.

I've also learned to incorporate a week off every 3-4 months, to keep this from happening again.

-Nat