Bowel problem

Hi all im new to this
For the past 9 months ive had a niggling pain in my low left abdomen i went to a GP twice to be told try ignore as it doesnt sound sinister. Recently in the past 2 weeks ive noticed blood in my stool. I go regulary every day no change in bowel habits just the constant niggling pain which is bareable. Im very worried it could be cancer. My stomach also gurgles a lot and i pass a lot of wind Has anybody any similar experiences if so please let me know.