Thank you for your query. I can understand your concerns.
Recurrent symptoms of abdominal pain
or discomfort which is relieved by passing wind and associated with altered form of stool (in your case smaller stools with sandy/grainy texture) and feeling of abdominal distension-all may be due to IRRITABLE BOWEL SYNDROME
you should undergo the following initial tests
Stool for occult blood, leucocyte, ova, parasites, cysts & bacterial pathogensUltrasonography
(USG ) of Abdomen.
you may now increase the dietary fiber
Dr. T.K. Biswas M.D.