I decided to do a bit more Google searching and found this under Exercise vomiting and high blood pressure. Here was one link on the first page. Be watchful for pain in the left shoulder or arm. Dehydration is definitely mentioned. Lack of potassium can be an issue, so if he craves OJ, I would suggest diluting it with water and have him sip it slowly. Then as soon as the travel conditions are safe take him to a doctor. Also be sure he is having a good diet and supplements suitable for high blood pressure, and have him drinking 1/2 gallon of water a day to reduce danger of dehydration and reduced blood volume causing the heart to work harder to push the blood around.
http://www.popsugar.com/fitness/Signs-Your-Workout-Bad-You-10521276
Thanks for all your info. I googled last night too because it was just so weird that he vomited then slept on and off all day. He woke up today feeling ok but sore and drank a ton of OJ (right out of the bottle, lol). I made sure he had water throughout the night.
So he did the same thing today! Shoveled again for a few hours and came in sick and went right to bed. A few hours ago he had some soup and a little bit ago he had leftover Spanish rice and tacos. He’s sore but says he feels good otherwise.
The doctor thought it was the flu when he returned my call yesterday but I’m not so sure. I’ll keep an eye on it. Thanks again for the info.