D.P.
My son gets anxious to although he doesnt throw up. Ive noticed when he singing in front of a crowd I keep seeing him take big breaths and he acts nervous even though he says hes not LOL!! Just try to talk with him before the play concert etc. Be positive with him try to do something to relax him. I bet he gets the stomach jitters. I do when Im nervous and I feel nauseated. I take deep breaths to calm down.