Abdominal pain near naval. Or tumour?

I am suffering from abdominal pain near naval (left and right both side,especially in right side),sometimes it is above belly button i extreme right side.this sharp pain comes suddenly but it does not last morethan 10 minutes and after sometimes the pain once again repeats.it comes and goes.in june month i have done ct scan it shows no other abnirmalities only loaded colon is there.endoscopy shows antral gastritis,sigmoidoscopy shows piles.plz let me know doctor what may be the reason of this pain?is it ibd or tumour?i am really very tensed as the pain occurs everyday.plz let me know.and guide me what can i do..advice some medicine plz...i get checkup from gastrologist and taken medicines as per guidence .but the pain lasts for 8 months...