I have Crohn's-Colits. Going on 12 years now give or take. Similar experience to you. I first noticed the same symptoms as you one day. It was the little bit's of blood and mucus only that scared the pants off me. I could get through the day but urgency was random and sometimes hit out of the blue. My bowel movements were always as you describe. Chunks of food, mucus and a little bit of blood. Sometimes just mucus.
Went to my family doc who said come back in a few weeks cause it's probably just IBS from stress. Two weeks later things were so-so (slight improvement) and it was left at that. I survived a year or two much like you with ups and downs, then one day I awoke and things just went really bad. Intense pain during a bowel movement, dramatic weight loss, swollen ankles, grey frothy stool.... I demanded to see a specialist and sadly like you experienced the closest appointment was 6 months.
I ended up in the hospital and this is how I met my fist GI and had my first colonoscopy. Actually the inflammation was so bad at this point the colonoscopy could not be completed. They actually asked me why I waited so long to see a specialist! Unreal...
Purely going off my experience, go to your family doctor and demand a referral to a new GI. Then tell that GI you want a Colonoscopy again and address your issues with the last time (no biopsy etc). It's really the only effective way to find out what's truly going on. Maybe even remind them once more just before they scope you to be sure.
If you happen to be in the Greater Toronto are there's a special clinic with great GI's and very, very short wait periods:
www.tcc-clinic.com Though I go to McMaster now with Dr. Marshal who is pretty darn awesome.
Post Edited (Canada Mark) : 3/23/2015 10:29:15 PM (GMT-6)