i got severe abdonimal pain with discrete time frequency after eating my dinner with no appetite,it was first time to get such pain,i went to emergency iwas diagnosed to have gerd. used omeprazole for 14 days and zantac for 20 days very cautious with my food ,one day ate almond butter with an egg and dinner (fish,salad )with no appetite,i got the same severe pain how do you diagnose my case