Upper Stomach pain after eating (waking me up in middle of night)

I am up right now (3:30 a.m.) awoken 6 hours after eating with upper stomach pain- been happening for years in addition to SEVERAL other complaints and lots of drs who can't help me. Reading posts made me feel better that I'm not alone but so sad to think all of you have these awful symptoms and no answers. I don't know what to do and feel crazy for the complaints. I have cut out meat, dairy, gluten, and have seen every dr under the sun. Symptoms: Pain after eating- nausea after eating even small amounts, sometimes, intense upper stomach pain that wakes me up from sleep 6 hours after eating, thirst after drinking 12 (usually more) glasses of water/ day, diahrea that will sometimes follow, hunger after eating, trouble sleeping, constant fatigue - I don't know what to do and just want to know what's going on :( I'm not an anxious person and this is not in my head like some have said. I also have several allergies and getting the emptying scan would (I think) be helpful but I beleive you have to swallow some type of sulfa? Allergic to ceclor and other drugs which make it challenging to get the test ... Anyone else know more about this?) So sorry to all of you experiencing this pain as well and if you have answers please share.