11year old gets sick every 3 months.abdomen pain near belly button.feels nauseated, vomits mucous, last episode 3 months ago: lower gi bleed..now again?

See GI doc: A number of things could cause these symptoms. A meckel's diverticulum comes to mind. This is an abnormal area in the intestine that occurs during fetal development. It can cause symptoms that come and go, including pain and GI bleeding. A doctor who specializes in the digestive tract (gastroenterologist) might be the right person to figure out what's going on. Ask your provider to refer you!