Hi. This is an injury where the internal injuries may not be very obvious. I would think of a more serious matter if there is a history of fall from a height like ladder and patient has these symptoms as you have noted. It looks to me that he may be suffering from a retroperitoneal hematoma may be associated with head injury. This is because of the symptoms you wrote- He needs to go to hospital. A Doctor has to clinically check for signs of an internal injury to the abdomen and head. Accordingly a CT scan of the abdomen and head will be done to confirm the diagnosis. Till then stop giving him anything orally. Wishing him an early recovery.