I went go-karting on holiday on Wednesday and there was something up with the kart. When accelerating, the seat would continuously bash into my back.
Five minutes after finishing, I had a hefty lump in the place it was banging against at the bottom, but that seems to have gone down a bit now.
Still, I was feeling a different kind of pain. A pressing sensation further up my back, right in the middle. I've asked a friend to feel each bone, and one in particular will rock/click back and forth when pressed on.
I can't stand up for long periods because of it. Any ideas?