I had a similar experience about 5or 6 years ago. It could be the foo dogs namely your frontal lobes fighting your desire to be free of random thoughts. In the case of meditation sometimes its a good idea to seek out an experienced practitioner, someone who can help you navigate through the possible turmoil that can accompany such practices.
Hello I would like to re-introduce myself here if possible. My martial linneage is yang style tai-chi(tt liang) through allan schwerdt at turtledragon tai-chi. He was a student of stuart alve olsons. I also practice wing chun eddie chong linneage through david anderson here in duluth MN. I am 39 years old, male and have been studying martial arts for about twenty years.