Motoracer:
Your job sounds stressful. I've only had desk jobs my whole life and am in awe of people who do the kind of work you do. One time I read that to even hope to become proficient at a complex skill like playing the guitar (I think what you do falls into this category), a person has to have at least 10,000 hours of practice. Once they've put in the hours, then enough skills are there to have enough profiency so that the practicing and learning and working are more enjoyable. So if you've been doing this job for less than 2 years than give yourself a break. On the other hand, you've been going through this for years and years, maybe reevaluate your career?
Myst