Please go see a gastroenterologist. Crohn's can be a very serious, life-threatening illness. You can and should do everything possible to decrease inflammation (ie, GAPS, specific carbohydrate diet, etc.) but sometimes a short-ish course of treatment will put you into remission.
I had a fullblown presentation for my first (and only) bowel episode: uveitis, erythema nodosum, severe sacroilitis and spine pain with sciatica, and bloody diarrhea. (My colon was affected by Crohn's.) I went into remission quite quickly with Azulfidine and never needed meds again....and that was 30+ years ago.
I hope you get well soon. Take care of yourself, be wise.