This video just scared the shit out of me. I'm 29 (the age TotalBiscuit was), have been having some similar GI problems he described, and have a family history of colon cancer. I think I should probably get it checked out.
Don't wait, don't put it off. Make an appointment today or tomorrow latest. Colon cancer is one of the most survivable cancers, IF caught early.
Hope it turns out to be nothing. good luck.