Surgeon did the proctoscopy and says it's ok. i had a problem of on/off mucus in stool from last 3.5 months after anal fissure. gi doctor says i should go for colonoscopy but surgeon says mucus is not a problem at all. what should i do now?

I will suggest that you get stool analysis first. It will check for color, consistency, quantity, if stool has mucus, pus, undigested meat fibers, harmful bacteria, virus, fungus or parasites. It will also check for levels of enzymes trypsin & elastase. High level of fat will narrow down to disorders affecting fat absorption. Low pH may be caused by poor absorption of carbohydrates. Hope it helps