The past couple weeks I have just felt awful on my rides, especially longer ones. Last week I did a 50 mile ride and it was harder than 100 miles. I though it was b/c I didn't eat enuf breakfast or didn't drink enuf or something. This week I felt awful again, not quite as bad. On my century I started feeling bad at mile 80 with pain in low back and shoulders and headache. Now it seems I am getting those same pains much earlier and can't seem to deal mentally as well as I used to. I don't think it is overtraining b/c I haven't upped my training that much and feel fine between rides. Do you ever just go thru a slump? How do you get over it? The mental part is the worst.