Why does this always happen to me?

im 13 and everytime i go to a theme park and i get off a scary ride icant feel my body and i feel like im dreaming!This is serious!BTW i did eat breakfast!This happened to me when i went to disneyland and sixflags this always happens to me!I got of space mountain on disneyland and i felt like was dreaming and i couldnt feel my body!HELP!