Oh sheesh!

Sometimes, when I am in one of my forums, for some unknown reason, unknown to me, the display suddenly goes up and down wildly, the rapid movement of the printing on it, giving me the most tremendous headache, and, it seems to continue, till I react in some way, I suspect that if I was epileptic, this would have triggered a fit, but I could be in error, as I am not epileptic, and have never had a fit.
OH BROTHER, when will they stop trying to force me to 'prove' I have mental problems, for reacting without any visible reason is an indication of mental problems, right?