Is there such a thing as paroxsymal UMN syndrome?

[FeatherMe]

I went to http://ntiasiapacific.org/chapter_umns_print.htm There I found pictures of what happens to me. My elbow, wrist, fingers, stiff knees, and equinovarus foot. I also found I fit under the negative and positive signs. In a 12 year period I had three concussions, the last one being the most severe - knocked myself out when I fell on about four inches of ice in the parking lot where I worked, I have no memory of falling and don't know how long I was out, I had postconcussion headaches for six weeks until I was healed at a healing service. My symptoms had first started after the second concussion but only included my right arm. After the third, the stiffness went body wide with the exception of my left arm. I only have these episodes from touch or position. They have been lasting two to three hours. What do these pictures and my descriptions of the progression suggest to you?