upper stomach pain and vomit

I had stomach pain for 2-3 year now, at first it like little pain  normally it  happen after dineer, recently it hapeen and take about whole night pain at stomach and i need to vomit out the food,( i only can let it vomit out after taken pain killer and 2 minut later i will be vomit and feel litter better, the it start pain again and vomit again til next day.at this thing happen ,i need also stool.i had gallstone remove last year, it make me 7 months no pain and felt so happy,but now my stomach pain and vomitting back again, what should i do? i had done endoscopy check too, they found out the gall stone and i did the key hole surgery too.but why still the stomach pain and vomit, it not the normal pain in upper stomach...really need someone who can help me?