I have suspected Gastritis...I say suspected b/c I have the symptoms but dr. did not think necessary to scope at this point. I did get tested for H-pylori but was negative for that.(I got the blood test). I take Lialda but have been taking it for years, so for me, I don't think it was that.
I started w/ Nexium (after a few weeks had bad stomach pains), than tried Zantac (again, after a few weeks had diarrhea and cramps) Finally was put on Carafate (a coating agent which seems to be helping). I also take dgl which is otc.
Let us know how you make out w/ the scope.