My Son, Who Is 19 And Away At College, Is

My son, who is 19 and away at college, is having difficulty with nausea and vomiting. Sometimes with food and other times just dry heaves. He thinks it might be related to motion somehow. Nothing hurts and he doesn't feel dizzy. He can feel it in his throat first and then can't hold it. It seems to be happening more frequently during each day and has been increasing for a month now. Any ideas what he can do to help himself for the moment? He is drinking sips of water to try and stay hydrated.