I second the Benadryl recommendation posted earlier. Working with wet live rock can cause problems. It's very easy to scrape or puncture your skin on the rock. Once that happens, the same bacteria that are so beneficial to life in the tank can create problems for us. If you see a scrape or puncture, is there any discharge? Do you have any color moving along the veins in your hands or arms? Are you running a fever? If any of these are true you should get to the doctor. If not, watch the area carefully and if it doesn't improve or any of these signs come up get to the doctor.
In the future, I'd recommend gloves for working with live rock in the tank. When working with rock outside the tank, regular water changes, or doing mild cleanup I don't worry about the gloves, but if I'm moving rock, stirring the sand, or doing any other digging in there I use my shoulder length gloves. I don't remember the brand but they're orange and blue and are thick enough to prevent punctures but still give enough dexterity to allow me to work. You should get a pair.
Mike