C., I have to say I smiled when I read this. My son is now 16, but boy we went through that also! We thought there we something seriously wrong with him, but there wasn't. He would go through "twitches" of all kinds. We did bring it to his attention, to get him to notice that he was doing it, and it would stop after a couple of weeks, and then he wouldn't do it again! He did the blinking, then he would do some kind of a grunt, like he was clearing his throat. The doctor said it was normal, not all kids do it, but he was. The doc did say if it continued for a long period of time, to let them know and they could run tests but it didn't last for more than 2 weeks, and then he would move on to something else.
I hope this helps. My son has grown to be a healthy young man, and NORMAL! Good Luck!