What is it?

Hi guys! First post here, around Christmas time my body couldn’t tolerate ANYTHING, had cramps, nausea, constipation, the works. I ended up going to the ER since it was disrupting my day to day activities due to the horrible burning and cramping, they said everything was normal! Tests came out unremarkable and told me to write down triggers. For some reason My tests showed I had no issues with gluten but I still steered clear of it since my stomach always felt awful after eating it. My symptoms improved. But now, 3 months later, my stomach is always upset now? Even without gluten. Anyone has similar issues?