Rectal Inflamation during bowel movements causes a lot of discomfort?

Only yesterday I developed inflamation in the rectum, and can't sit on a chair without having to tilt to one side to easy body weight off my rectum for comfort. During bowel movements, I noticed mild bleeding too and the process of bowel movements causes a lot of discomfort as there is burning. Will drinking milk do some good here, or what is it thats happened to me ? Any help, please ?