I don't know for sure if this is it, but I remember experiencing in my younger years, that after several ejaculations, they would start to hurt, and once they did reach that point, every other one would hurt more than the last, in the exact same way you describe. I also had, the false alarm with the peeing before, but not the burning. I'm not sure, but it sounds like the same thing that happened to me, and all my friends
. Hope this helps.