colon problem

hi there

i am a 15 year old boy who is very athletic and active. For the past few weeks, i have had trouble taking a normal poo.
I went to the doctor and he said that i was constipated and prescribed a medication called metamucil. I didnt take it since my father already told me it wasnt effective compared to the laxative called covulax. So he went to buy prune juice and it actually worked. However, i noticed a  change in the stool . They looked thinner and much softer.There isnt any blood visible to the eye but what bothers me is the fact that every time i poo, my stomach grumbles and i usually get this "sick feeling" in my stomach. I just hope it isnt anything serious. Please update as soon as possible.

P.s. prune juice is finished, hoping i will still have proper bowel movements.

[HeinrikMD]

please see the post in the colon cancer forum