I got diagnosed relatively quickly. I had mild but chronic diarrhoea, which hadn't gone away after a few weeks, so I went to my GP. Miraculously enough I got one who didn't tell me it was stress or IBS and "come back in 6 months if it wasn't any better". He arranged for blood and stool tests. No idea what they showed, but I got a referral to my local hospital who did a colonoscopy and small bowel barium follow-through. Zing: Crohn's disease.
Precisely because my symptoms were so mild (pretty much 1 loose BM a day, no pain, fever, blood, etc.) I actually didn't believe the diagnosis for a long time. I was dumb.
Anyway, yes I have a suggestion. Get small bowel tests: pill cam, barium follow-through and/or MRI scan. Don't be fobbed off with an endoscopy, the docs need to see the entire small bowel.
Dx Crohn's in summer of 2000. (Yay )
Tried and failed: 5-ASAs, Azathioprine, 6MP, Remicade, Methotrexate, Humira.
Diet didn't make any difference either.
Had surgery 2/13 - subtotal colectomy with end ileostomy. Currently on no meds and in remission. Also prone to depression and anxiety. Ask me anything >_>