My son has experienced sudden onset nausea and dry heaves with muscle cramps, no vomiting. It began last night about an hour and half after dinner. He said he was hungry, ate an apple, then started having aggressive nausea, abdominal cramps, dry heaves, but no vomiting. He woke this morning without symptoms, and then just before dinner tonight, the symptoms reappeared, seemingly stronger. He did eat dinner tonight. The symptoms are currently present. It just seems so odd to have the symptoms reoccur approx. 24 hrs. later. Any thoughts?