I have this exact thing! It can be very frustrating when I am so hungry yet the pain is so bad. I have been diagnosed with duodenal gastritis (which they assume is due to the crohns) which apparently makes it harder for the food to pass, causing the pain.
If it continues on I would certainly mention it to your doctor, i just put it down to another Crohn's symptoms and it was only after i was admitted to hospital due to me vomiting every 5 min all day that the duodenitis was picked up, it had stopped food from leaving the stomach!
I have anti nausea medications now which can help settle down the nausea. And I am also on omeprazole. Buscopan also really helps relax the bowel as well!
Despite these I still have pain after I eat very frequently, I find eating food slower helps, chewing it properly and not having massive heavy meals helps. I stick to soups if it gets really bad as that doesn't irritate it as much!
Xx