Mostly, his gut hurts. A lot. He's really starting to feel that kick. And his arms hurt from the energy impact of the fight.
He'll be fine come morning. Sunshine, sleep, he'll feel human again. Physically.
He sheds the uniform in the lounge room, not caring if anyone else is in. Stagger out to the bathroom and throws up. Keeps drying heaving long afterwards until he gets to the shower and can turn that on, curling up in a ball around his aching gut under the hot water.
But hey, you should see the other guy.