I have all the symptoms of colon cancer.

Hello Doctor Please help me I have stomach issue since my childhood. Last year in September I had blood in my stool and my anus was hurting really badly for 1-2 days. Then after sometime I had blood again from my anus which hurt again in March and also I have a small skin tag like thing around my anus which hurts occasionally. Then in May I had blood again after a tight stool I went to the doctor and he gave me milk of magnesia which helped in making stool soft and I had no problem. He also asked me to get an ultrasound done of the whole abdomen along with LFT and RBS. All the things came normal but on the day of my ultrasound since I had not eaten anything my stool was tight and I had little blood and my anus was again sore. Also a huge white worm came in my stool. Please help me I am miserable and scared to death