If you are not sure then you must get done a X ray
of chest with abdomen standing . so that the stapler pin will be visible if its there in the body. You should eat bananas, they are the best way to help. the bananas form a layer inside the body and also push the food ahead , So that the pin will not damage.
Get a Consultation at hospital as x ray is required.
And you should take care of your constipation
going once in a week may cause problems later in life , eat salads as many as possible and avoid junk food.
In doubt do reply