I checked it out online and found that I may have this condition called misophonia. "People with the disorder are not bothered by the loudness of sound — rather, the softer, repetitive, common sounds are the ones that drive them up the wall."1
I found that this is such a common problem that there is a website all about it: www.misophonia.com. There is a self-test available with the different levels of the condition and I think I'm between a level 4 and 5 - not very serious but bad enough for me.
I am ok with white noise or people talking all around me, like when I'm in a Chinese restaurant which by the way is one of the noisiest places in the ordinary world. But I really get irritated with repetitive sounds that keep to an incessant beat. Argghh!!!