Burning sensation in my stomach area (upper)

I have a burning sensation in my stomach. The trouble began about a month ago. I woke up with certain organs hurting, my kidneys, liver and stomach were the main ones. They felt real aches and pains. Couple weeks later, I noticed a burning sensation in my up GI, right below my rib cage. It was moderate pain and burning sensation and my skin (in this area) is warm to the touch. It mainly hurt after I ate something. I had gastric bypass surgery well over 24 years ago,and  have always had stomach issues, mainly acid re-flux. I have also been diagnosed with Diverticulitis, a year ago. This pain is not the same. I have no fever or chills. I went to  walk-in clinic ad the nurse seemed to think it was  Pancreatitis. They took blood and I will soon know. I did some extensive research and I don't have the symptoms of nausea, vomiting, fever etc. I did decide to fast from any food. I am only drinking water. If I were to check myself into the hospital that is what they would do. Any advise, on what could be wrong with me, would be greatly appreciated. Thank you