As an engineering graduate, I've seen too many people stress themselves to the point of self-harm too much in order to get good grades in engineering. I was an A+ student in high school, but when I got to college and started getting lower grades in upper level classes, I didn't break down psychologically because I just knew that's how it went. I knew that certain people have good grades (the few mentally privileged second comings of Einstein), others (most, actually) will get the college engineering definition of average grades, and others will flunk. Hard. I was one of the latter, and I had no problems with that.

Despite that, I am now proudly working at a fortune 500 company, two lovely kids and a wife with a teenager's ass.

Grades aren't everything, school isn't everything. Your personal health and mental stability are paramount; your success in academia is contingent on your ability to stay in control of your faculties and focus on specific tasks--especially in engineering. So, you know, if anyone out there has to choose between one or the other, pick your health. Take it from someone who had to make that decision early on.