pain in my right groin going around my back

I called friday and they were going to speak with Dr. Jacob, they do not take GHI Emblem health Medicare. I would have to have a lower rate for a consult. I have not heard back. I am scheduled for my MRI of the pelvis with and without Valsalva tomorrow. It was supposed to be today but I ended up in the ER last night. Friday after eating the pain started under my chest so bad, it moved to under my left chest. saturday was abit better but my stomach was all blown out. Sunday was bad, I was afraid to eat and in pain. I went to the ER- I couldn’t even lay flat the pain was bad. They took me right away and ruled out a heart attack. They checked me out and did 4 xryas which Dr. showed me. Everywhere my pain was(upper chest now) and lower right was filled with gas gas gas. I was diagnosed with Gastritis and given Malox (ant-acid. I do not know what is causing it. I tired reaching my GI Dr. when I got home 10am today and never heard back.