Originally Posted by Carbonfiberboy

Try doing shorter hard rides. Century rides for training are actually not the way to go for LD races etc. Keep it down to no more than 4 hours and go harder. Even shorter is probably better. How Long Should Your Longest Training Ride Be? - CTS

1 day 30 miles, hill repeats. 1 day 25 miles speed work. 1 day somewhat longer hard ride, 60-75 miles. Rest easy/moderate. That's how I used to train for 400k rides.

But yeah, you probably overcooked it. It's cumulative, so not just one mistake. Another thing: I never take 3 days off in a row if I can help it. 45' of easy on my rollers is a better idea. Hours, hours, hours. Base, base, base.

There's an overtraining thread over in T&N that might be helpful: http://www.bikeforums.net/training-n...rtraining.html