There's actually some people on the Forums who give advice, E.X, Sir Dooble.
True, but I always give the advice of visiting a doctor to every single health-topic.
When I give other advice, it's usually from personal experience.
I've had burning wee before, and it came back that it was due to a water infection. The simple result of that was I had to drink more water. The clearer and less yellow your wee is, the better in general.
But, I didn't have a physical injury that happened at the same time, so my situation was different.
So, I would recommend visiting a doctor, because while it might simply be a water infection, it could be worse. And it's always best to get the worst option ruled out.