Thanks again everyone.
On a serious note, it just shows you should seek medical attention if you suspect something isn't quite right. Ignorance isn't bliss.
It was only my mum, insisiting I should go and see the doctor, that ensured wheels were set in motion.
After the inital pain had passed I thought I was ok. The doctor, then the paramedics, and then the staff at Blackburn Royal, made sure treatment was given straight away, for which I'm now very grateful.