What Causes The Upper Abdomen Pain In Hunger?

I have intense pain in my upper abdomen when I'm hungry. The pain is sometimes so bad I can do nothing more than hold still and try to stay calm while it's happening. It also wakes me up at night and I have to eat something for it to go away. I've had an upper GI scope that showed a hiatal hernia along with inflammation in my esophagus, stomach and intestines. My doctor put me on omeprazole which did not do anything for the pain. I've also now had a ct scan with constrast, and two MRIs with contrast. The ct shows lesions in my liver and adrenal gland, but no other abnormalities. The MRI scans showed the lesions to be benign and my doc doesn't think they are causing the pain. We're at a dead end now. She doesn't know what else to do for me. Also, I had my gall bladder removed in 2009 (these pains began shortly afterwards).