Turns out his cold and coughing have messed with his lungs to the point where they're all constricting. So he's now got an inhaler to use until it clears. It about broke my heart the first time he used it after we got home. He got his two blasts, took a breath, and then beamed up at me and exclaimed how wonderful it was to be able to breathe.
Craig had mild asthma as a kid. I had a chronic bronchial cough. Poor Alex never had a chance, lol.