bro - you NEED to see a doctor.
let me tell you a little story about a friend of mine..he had the same symptoms as you - ****ting bright red blood etc. anyways he passed it off as "well maybe its just hemorrhoids" and "it will probably go away". so time went on and it got worse. WAYYYY worse. long story short; he did nothing about, and ended up so sick he had to go to the emergency room and was diagnosed with ulcerative colitis
.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001296/ (read up on this link)
he was a pretty big dude but he let his condition get so bad that he was forced to stop lifting. lost 60lbs since. had he gone to the doctor sooner he would have saved himself alot of agony and his condition would have never got to the point its at today.its your body bro - i cant tell you what to do, but you know you only got one. so my advice would be to do whatever it takes to get yourself the proper medical attention/opinion.