believe me you are not alone, what have I told you all these time, my major problem, my mind cannot stop working (as if you could ever "stop" thinking) but what I mean is my days are terrible, my 2 inner voices constantly talking to me sometimes about important things sometimes worthless things, is the "mind-clutter" like you say.
Sometimes I think the only way I could relax is going into a coma!
But think about it this way, you are the super-thinking machine.
Talking about playing with your mind. I have a game, I instructed one of my inner voice that every morning as soon as I wake up to remember a song, a different song every day, so far I have been able to remember about 90 songs, since I have kept doing this for about 3 months now, the funny thing is I even remembered some songs I used to sing in elementary school that I thought I had forgotten!
So the question is, do we ever forget something we learned? or we just misplaced it in our mind?
That's for your to find out ;-)
Regards.