Thanks for posting,
It seems like your son is having a bowel disorder that is likely induced by a type of food intolerance
. There are numerous number of causes of persistent diarrhea
or bowel disorder notably lactose or fructose intolerance
(this will require that after the diarrhea is controlled at a clinic with medications, you will have to identify a food pattern that might be causing it), gastroenteritis
(infections with virus, bacterial, protozoa, fungi can lead to persistent diarrhea especially if appropriate medication to eradicate either is not provided)- a need for a stool exams +/- culture might be necessary; irritable bowel syndrome
(confirmed only after excluding other causes) etc.
With your description that the stool is frequent, sticky and has a bad odor drives more towards bowel infection. So there will be a need of antibiotics.
Hope this helps