I was on some very large roller coasters two day ago. After only a few the headaches became worse and the nausea started. I was dizzy, shaking and at times needed help walking. I have had several severe concussions and more than a handful of minor ones in the past 45 year s. Since coming home I am more tired than usual, major headaches, dizzy, nausea still and light sensitive. I have tried advil and it doesn t work. Did I get another concussion due to the roller coasters or should I be worried that it could be something worse. Jon Hemley