In the book, it talked about how when you are stressed, the sympathetic nervous system does things like: increases blood pressure, blood sugar, and heartbeat and slows digestion. Things like this (especially the slowing of digestion and low blood sugar) can cause you to feel sick to your stomach.
It could also be that possibly our immune system becomes weak when we are stressed from these reactions in the sympathetic nervous system and we do actually get a virus.
My third guess is that maybe we get so worked up about things that are going on that we have the symptoms of an illness in our heads. Our brains are powerful things and can do that kind of stuff.
The most simple reason I could think of is that it's just in our heads that we get sick EVERY time we are over stressed. It really only happens a little bit, but we only realize it when it does. (if that makes sense)
I would say i agree with the last point, where you think its all in your head. Truly, life is a mental game. The way you think about yourself and other people or if you're sick or not can affect your body amazingly. If you think you are going to make a free throw in basketball or think you are going to make this tackle in football, it often does happen. The placebo effect is a classic example on these things (sorry about the spelling).
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