Your scenario sounds a lot like SIBO (Small Intestinal Bacterial Overgrowth). I notice that you are taking Prilosec (a Proton Pump Inhibitor). These commonly reduce your stomach acidity below the level required for you digestive enzymes to work. This results in undigested food entering your small intestine. This, in turn results in a reduction in the peristalsis due to sensors in the gut triggering braking mechanisms due to undigested food. This then allows bacteria to multiply in your SI. PPI's are a known cause of SIBO, but the doctors don't consider it clinically significant because it is less severe than some other causes of SIBO. In combination with your Crohn's though, I would guess that it causes "clinically significant" symptoms. Refer your GI to:
http://www.nature.com/ajg/journal/v103/n12/abs/ajg2008607a.html