That buzz thing doesn't sound a whole lot like OCD to me. It sounds like it's not really related to anything obsessive even though you may worry about it. But let me ask you this; which came first, the buzz, or the worrying? Because maybe you worry so much that the feeling becomes physical, or maybe the buzz is unrelated and it upsets you. Does it seem to come when you are worried more?
I've never experienced anything exactly like it, but the medicine Neurontin gave me "brain shocks", where it was like electricity was passing through my head and out my eyes. We never did figure out exactly what that was. But it never paralyzed me, though it was extremely uncomfortable and it was also something that I could hear, and it was as if my vision was being jerked sideways. At its worst, it seemed to be brought on by loud conversation and other noise, looking at lots of movement, color, or intricate patterns, and almost invariably, exercise or whenever my heart rate would go significantly up for more than like 5 minutes.