Hemorrhoids Weight Lifting

Have I got colon cancer or is it a hemorrhoid or a fissure?
Im a 21 year old male and for the past 6 weeks I’ve been passing blood in my stool. Im a regular gym user I lift weights 4 times a week and I eat lots of protien, the bleeding started when I started taking creatine and I’m off it now, I fealt constipated and really forced myself and blood gushed out, the GP said its a fissure and he gave me soem suppostiroies( proctededyl), they stopped the bleeding for a while but its coming back and its more frequent, bloodier and darker, I also get abdominal cramps and bloat, I also feel when I go to the toilet that I havent had a full bowl movement and strain and bleed more, soemtimes I feel constipated and sometimes I have diarea, also when I feel Im about to break wind it turns out to be a bowel movement. I dont feel weak or smaller but the opposite and my appetite is the same and I dont feel aneamic. The blood is somtimes bright and sometimes, the blood is usually at the end when Im finishing up. What do you think it is? What should I do?
You need to go back to the doctor.
treatment for internal Hemorrhoids