My son has had stomach pain for the past month. He originally had a stomach bug and was severely congested so his doctor gave him an antibiotic . His stomach pains have not gone away (the pain is by his belly button). We had blood tests done, a urinalysis , and his stool tested and all test were normal. Tonight he vomited pretty forcefully and it was brown with darker brown bits in it (it didnt really look like coffee grounds). What could this be?
Hi welcome to Chat Doctor forum.  Thanks for choosing Chat Doctor. F.  As you describe your son had stomach pain near his belly button. Nothing fault found in stools, urine, and blood.  Most probably the condition is intestinal worms, or lactose intolerance, confirmed by reducing substances in the stools, may be school sick less. The brown vomiting could be due to oozing of blood due to severe gastric irritation.  I advise you to consult a pediatrician for diagnosis and treatment.  Wishing for a quick and complete recovery.  Best regards.