My son has been sick for 4 days.  Symptoms are nausea, vomiting, tired, no energy, no fever, pail, dehydrated.  He can keep fluid and food down during the day but hasnt been much, worse pain in the evening, he wont drink or eat anything and finally vomits.  He vomits before he goes to sleep around the same time every night and then he sleeps all night.
HI, I have gone through your query, thank you for asking us on Chat Doctor! The symptoms you described are typically found in gastrointestinal disorders that may be caused by many factors. The common cause is viral infection or gastric flu. The symptoms may persist for a couple of days. Anyway some other medical conditions related to the liver and other organs may give similar symptoms. So I would suggest you to do a complete blood count, blood glucose, and the tests that indicate the liver and kidneys function to see your sons general health status. If anything is ok then supportive medications and vitamins may be used and a well-balanced diet is important. Take foods that are easily digested by gastrointestinal tract, lactic ferments, vitamins and a lot of fluids. Take care! Best regards! Chat Doctor. 