Can I add my +1 to the "I've done this too" list? I was learning to ski, and went over a small bump, lost my balance and sat on the small bump - which was a rock. I think I broke something, but couldn't imagine getting my arse in a cast, so didn't even bother with a doctor. It has healed fine, but did take broken bone length of time to heal. The last inches sitting down and starting to stand up were agony. I used to attend mass back then, and even now "let us all stand to say the Lord's Prayer" makes me wince with the memory.
Probably worth wasting a couple of hours of the NHS's time to make sure there is nothing that needs attending, but I suspect your treatment will be the same as mine.