I just had a colonoscopy about a month ago. I had the same symptoms
I had bloody stools as well as mucus in the stools. I'm 27 and my grandmother died from colon cancer so I was scared to death to get the results of the scope. The blood was bright red so that meant that it was fresh (from the colon, not small intestine). I didn't have much pain that I can recall when I was on the pot. Sometimes when I traveled I'd get constipated and the only thing that would come out was blood/mucus.
I went through the colonoscopy and it was a breeze, the drugs they gave me put me out about 5 seconds into it and all I remember was waking up in the recovery room. They did take a biopsy and the result/conclusion was that I had something called proctitis. It is an inflammation of the lower lower intestine, like a few inches up in ya, and not way up in my colon. The dr. gave me 2 weeks worth of hydrocortosone butt pills and that cleared everything up. I still have had a couple episodes of blood, but other than that am normal and KNOW that it's not cancer. I think just knowing that it wasn't cancer helped my health out. He said they don't know what causes proctitis but it may come and go and has potential to spread upwards in the colon. So from now on if I have outbreaks I just get the perscription refilled and that should treat the symptoms.
As for the insurance side of it, I have blue cross/blue shield PPO and I am out of pocket almost $1,000 even. Sure it's deductible for my next years taxes, but it's quite a bit of money. I guess though it's better than waiting for ever and if it was cancer, having it spread and get worse, causing more $$, surgery, death, etc... I just think of the $$ as the missing AR in my gun collection. I was going to use this year's return to make and AR out of my stripped lower, but I'll put it off another year.