Maybe PB19 can also be latent and causes problem but I'm not sure.
I have this pain too in my stomach for more that 6 years, I did an endoscopy and they found a gastritis. I have to eat constantly so I feel better. I think in my case that it is a latent herpes virus that lies there, and that is causing a "mild" inflammation, although the consequences are huge. I did the test for enterovirus (coxsackie and echovirus with neutralization tests) that came back quite negative. I'm positive for EBV, possibly HHV7 too. PPI helps me but it is not a miracle. It is definitely worse if I don't take it.