Anal itching and pink on stool

Hi, for the past couple of years i have been experiencing on and off anal itching, at some periods it can be intense and others mild. That being said over the last 6months I have been noticing my stool has bright pink stains and sometimes the stool is very watery with pink stains on it as well. I have also seen that when there is no pink stains, my stool is usually oddly coloured with some parts being much darker then others. I havent experienced any severe abdominal pains but sometimes I do notice a slight pain on the right side. As far as fatigue goes, I usually do feel tired throughout the day but I take part in alot of athletic fitness programs and usually I feel fresh after all workout sessions. I would be most gratefull if you could assist me. Thanks