Hi there,
Most people wouldn't be registering body sensations that are only happening for 1 to 3 seconds, intense pain would get anyone's attention no matter how brief it lasted but what you are saying is this isn't actually painful, it isn't burning, it isn't numb, it isn't tingling, it isn't throbbing, it isn't itchy etc its "just annoying"
The only thing i can come up with is related to the effects stress hormones have on the skin and hair follicle's so maybe this annoying feeling is being caused by you worrying all the time, a stress reaction is inflammation and it can cause patches of scalp or hair follicle sensitivity, along with a lot of other scalp issues, it's worth considering as a potential explanation for what your feeling...
Hope it helps......JJ