IBS or IBD

[ajeeshjohn]

I am 23 Year old male Weight 43 kg ,Since last I YearI Have loose stools in the morning 2-3 times,small amount of stomach pain in some days, in some days i have burning sensation above anus, also i have bad odour from my stool ,  also size and colour of stool is also changing,
then i have done blood and stool test it says it is normal then ihave done a colonscopy and my biopsy report says
"section shows colonic mucosa lined by columnar epithelium.lmina propri shows edema normal glands and mild inflammatory infiltrate composed of lymphocytes, histocytes and plasma cells. negative for cryptitis/crypt abcess/ granuloma/gaint cells.negaive for a typical changes."
DIAGNOSIS RESULT :- CHRONIC NON SPECIFIC COLITIS
and doctor says you have no irritable bowel syndrome, You have disease in the catgory of IBD and then i see another doctor he says you have  Irritable Bowl Syndrome. and i get confused  what really i have, IBS or IBD Anyone here please help me,  I have also dust allergy and asthma,  When I am going to travel for two days it will increase, and I am also a overthinking person.