jk5493, my daughter has had a similar experience with mucous, blood, weightloss, nausea, etc. She hasn't had a colonoscopy but did have an endoscopy, which found mild inflammation in her esophagus and her duodenum. Her GI treated her for GERD and that resolved her upper GI discomfort to a large degree. Her GI has spent the past year trying to figure out what to do about the mucous and the occasional [very small] amount of blood in her stool, and has opted to do nothing.
There is a test called calprotectin that will find inflammation markers in stool. It's about 90% accurate for predicting inflammation in the bowel according to papers I've read. My daughter's GI won't do the test because it's expensive and she (the GI) would scope her patient to verify anyway, but maybe it's a test you can consider. And don't forget about the pill cam.
My daughter is almost 13 and most of her stomach complaints happened at the onset of puberty. I really think the surges in progesterone and other gonadal hormones exacerbated issues with acid production etc. It's possible my daughter will eventually have an IBD diagnosis - when I was 12 I felt just like she does. But I didn't get a diagnosis until I was 39.
Sometimes it takes a long time to figure this out. I'm sorry it's so frustrating for you.
50 yrs old, IBD diagnosis in spring '01. Proctitis, gastritis, ileitis.
Pentasa (3g/day)Colazal ( 96 pills/day), Sulfazine (1.5 g/day), Prevacid, folic acid, vit. D (2K iu), flax seed oil (2 tsp/day), mesalamine enema as needed. Gluten free as of 5/30/11. Colonoscopy found no evidence of inflammation on 8/16/12.