GERD or Gastro viral infection or dismotility problem?

It's not GERD. Has your doctor done a test for H-Pilori? It's a bacteria that causes abdomin pain when eating, sometimes feels like an ulcer. It also feels like GERD symptoms. It's not something that a blood test, an EGD, or a CT would pick up. Stay on that Nexium. My best guess is H-Pilori, or IBS (irrital bowel syndrome). IBS is super common and the only real way to treat it is to find the foods that irritate it the most, and avoid those foods. I have a little bit of IBS and I know that mexican food, salsa, ice cream, and other things all trigger it. When I avoid those, i'm good. Good luck tho. Get the H-Pilori test done.