My husband is 45 years old. About 8 years ago he had a case of what we were pretty sure was food poisoning & went to the emergency room. Since then he has had recurring bouts of severe vomiting with weakness, paleness, chills & subnormal temperature. These episode usually start early in the morning & last about 8 hours - very intense & scary. He drinks water / gatorade, but it comes back up. It had been happening every 6 months or so. But, it happened 2 days ago & now it s happening again. Being in a hot bath or shower is the only relief he can find until it s done. It seems to stop as suddenly as it starts. Then his color, energy (other than worn out from retching for hours) & temperature all come back. What could it be?