You are putting a lot of physical effort into your job - that needs to be taken into account as PART of your training! If you are training to race (and I think I remember that you do), you need to be careful about how much you are really doing. And I agree with MP - 5 days of riding (your bike) a week is a lot - right now, I am riding 4-5 days, but I don't have a physically demanding job (desk jockey for an IT company). And the two days I DON'T ride, I'm not out doing another physical activity.

You're doing too much, and you're body is tired... Just my opinion. Be careful though - sounds like you are headed for burnout.

SheFly

p.s.
Do you have a coach? If so, do you tell your coach what you are doing for WORK in addition to your training?