Weekend Sickness and Work

I noticed that ever since I began working again, I've always felt ok during work weeks but slumped and all sick during weekends. This never happened before prior to my current work. What's different this time?

Then I realized that the amount of passion I have and the intensity of my engagement to my current work might be taking their toll on me. That when it's time to rest and unwind during weekends, the kinks are still there and my body just gives up and feels the maximum impact of my fervent drive at work. This week alone, 70% of my time was with meetings with different people, here and abroad (yes, business conference calls at zip conferencing). The remaining was devoted to reports and coming up with analysis on challenging areas.

I know I should take care of myself more, just chill a bit, and maybe lower my level of engagement just a tad bit.

I really don't know why I've become so devoted with my current job. I just hope it's worth all the weekends missed due to sickness.