I've been through a tough week of (final) exams. even when I don't understand the question and get stuck, I don't get stressed, I'm just super mellow as if I have zero feelings and I totally do not react. what I do notice is that I have to press on my forehead or pinch my left eyebrow (subsequently closing the eye) so I can concentrate. I will also get a mild headache (15-20% severity) on my forehead and the right side of the forehead may get a little tight (5-10% severity).
I still get nervous/anxious depending on the position I am in. i do not get nervous/anxious when I'm out in a crowd or anything though.