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.
Mark in Idaho
60 years old, retired due to disability, married 34 years, father of three, grandfather of four, Suffered a serious concussion at 10 years old (1965) stopped most driving after concussion at 46 years old (2001), Post Concussion Syndrome/Multiple Concussion/Impact Syndrome with PTSD, immediate/short term visual and auditory memory problems, slowed processing speed, visual/auditory processing difficulties, insomnia, absence seizures, OCD, 14 concussions since first concussion at 8 years old, Taking paroxetine for 14 years and gabapentin for 12 years. Added L-Tryptophan and stopped paroxetine after 3 months of tapering. I currently take 100 mgs of 5-HTP AM, 500 mgs of L-Tryptophan at noon.
As of Nov 15th, Due to high stress issues resulting in PTSD, docs put me on 3 meds. Clonazepam but only for 30 days ) .125 mgs twice daily (Doc presc. .25 mgs 2x daily but half a tablet is good) , citalopram (Celexa), an SSRI , and olanzapine (Zyprexa), an atypical anti-psychotic that usually causes weight gain before bed. I lost over 30 pounds since mid July. It just stopped the weight loss. Took me off the gabapentin.
May 2014, I am off the olanzapine due to a 6 fold price increase. Back on 600 mgs of gabapentin before bed.
Oct 2014, off the Celexa. The 5-HTP is doing much better and leaves me feeling normal as compared to being on an SSRI.
I am also taking L-Theanine to help with GABA regulation
"Be Still and Know That I am God" Psalm 46:10