Most important casue of vomiting could include gastritis, which is an inflammation of the stomach lining, sometimes caused by alcohol, smoking, and certain over the counter medicines like ibuprofen as well as by certain bacteria. Gastritis is more likely if you also have symptoms such as heartburn.As metochlorpromide is not helping hiim you could switch over to domperidomme 30 mg slow releae tablets along with 20mg Rabeprazole doses. Pepto bismol can also be tyaken with it for rew days. My theory is that due to post traumatic stress and anxiety child has devevloped Gastritis causing the problem. Consider all medications i suggested he would be fine in few days. Thanks.