I think you are addicted to working out. If you continue to push yourself, you're going to cause a serious injury. How would you feel if you couldn't work out for months because of an injury? Remind yourself of that anytime you are tempted. 1 day off is better than months off.

Find something else to occupy your time. Maybe get out for a coffee or beverage? Walk the mall? Read a book? Watch some TV? Take a long bath? Post on every thread on PC?