unikornfairy,

Welcome to NeuroTalk. I am sorry to hear of your son's injury.

Can you give us a better explanation of his injury. Did he fall and hit his head and continue falling and hit his head again? Or was this a coup-contra-coup injury?

Neck injuries that can happen during the head injury can cause gastric problems. A likely injury would be at C-6 to T-3, between the shoulder blades. I suffered an injury at T-3 decades ago and lost 20 pounds in 2 weeks. A Stanford GI doctor could not find the problem. A chiropractor finally found that I had dislocated a rib that was inflaming the nerves that lead to my stomach and esophagus. All I was doing when I injured myself was splitting firewood with a splitting maul. I swung hard and popped a rib out of place.

Hope this helps you get him the help he needs.

My best to you both.