I have to say, we have seen this. None of us are doctors, just a few scientists on the team. But, many of our visitors experience hightend anxiety before and after each dive, shore dive or not. Vomiting does occur nearly every time along with the sweats. Most of the people that we have seen this happen too have very stressful careers, and it sounds funny, but its as if the diving overloads their sensory system or something? We had a gentleman that was bad, maybe sick for 30 minutes. He was on medication for high blood pressure, that also treated PTSD and tremors. Did this have anything to do with it? No way for us to tell. He was fine, but it happened several times over a week long visit. He did see a nurse and all vitals where normal. Vierd?
Hope this helps!
John