Hi.
Thanks for your query.
First of all getting a treatment directly from the pharmacy indicated you ae not serious about the problem of your child.
The Medical field doesn't work like this.
If you are serious about a child , who is your son too, I would advise the following with the history you have provided.
* Clinical examination by a Surgeon / Pediatric Surgeon if you have in your city. This is important as a Doctor only can ask the proper questions. The proper history by you and your son can lead to a proper diagnosis.
* X-ray of the chest and abdomen.
*
Ultrasonography of the whole abdomen-
CT scan is done only if the Surgeon feels so.
*The routine blood, urine and stool tests.
The Treatment will all depend upon ::
* The clinical findings, reports of the investigations and follow-up results after medical management.
* A course of an antibiotic with
Metronidazole,
* Medicines for worms
*Surgery if the cause is surgical such as
appendicitis and so on.