Considering I have a neurological illness, that is exacerbated by stress, I can say that for me, one of the unusual stress reactions is near fainting. I've had blood work done, to rule out the usual suspects(diabetes, blood pressure, anemia, et al). Basically, under stress, I can and have had spells where I've felt like I was just about to pass out. That is not normal. When the stress trigger, from this latest round was removed, then I haven't experienced that.

Do you have any unusual psychological reactions, in mind, when asking about what stress can cause?