I have both the humming issue, and the rhythmic thinking/application problem. The humming issue has been going for a few years, as far as I've noticed, and has progressed to an incessant, uncontrollable, constant annoyance. (Annoyance isn't really the word. There really isn't a word to describe it. ) It has progressed to the point that, even while focusing on not humming, I find myself humming. Any time my focus shifts to something that requires my attention, like reading, cleaning, watching TV, or just simply having a conversation, the humming takes over, grows louder and more insistent. Even to the extent that I'll hum between the words I'm speaking, and during any pauses in the conversation. It's a constant presence now. Like its the desktop background, behind and in between every waking moment. Every second that I'm awake, no matter what I'm doing or thinking, it's there. I can't even begin to describe how much disruption it's caused. It will keep me awake, or wake me up. Sometimes it will shut me down completely, meaning that there's no point in continuing with whatever I was doing, and I just sit and hum. Ridiculous! I'm battling with this humming entity for control over my conscious mind. I even hum while focusing on not humming. It's like a shadow, but more closely attached, and it never goes away.
I've also had the rhythmic thinking/action issue for as long as I can remember. I always thought that it was just a quirk that was unique to the way I thought. I only recently learned that this isn't the case. It causes a lot of issues with reading and writing especially, but it affects everything I think or do. I'll even find myself breathing in the same odd rhythm.
Sometimes the humming will dictate the rhythm, or visa versa, but either way, it's incredibly disruptive. Enough to drive anyone insane!
Note: I suffer from MS, and have many different odd symptoms pop up from time to time, but this is unlike MS related symptoms I've experienced thus far. I am experiencing issues with immediate memory, and cognition, but this doesn't seem to have any relation to what I'm experiencing with the humming, or with the rhythmic thinking. I'd love to hear if someone can explain why I'm experiencing this, or has a solution.
BTW - I started typing this message at 12:00, and it's now 1:00. All the while humming the same 2 bars repetitively, non stop. One hour to type a simple message. Even when all other symptoms are quiet, having a cohesive, contiguous thought, and successfully applying the resultant action without a pause, is rare. Factor in the humming, and the odds of a timely, normal delivery are rather low, if not unaccomplished. Ridiculous!!