I read some article about the training methods lance uses by that carmicheal guy, or something. Heh. Only thing i remember other than how to mispell the guys name is that he said the most common mistake was overtraining. You can't really improve anaerobic much but you can improve aerobic training. So to answer the question if you want to improve yourself then by your description it is time to lay off the bike.

Improving myself is not one of my goals so i would ride if i felt like it or needed to go someplace. There's two books by the guy at the library i work at, goto ur local library and check one out if u want to read something intelligent on the subject.