I Have Pressure Up Under My Rib CAge In My

I have pressure up under my rib cAge in my chest. I feel like if I could belch I might feel better. Earlier in the week I was having pain on my right side in the back. oddly, I was found to have a blocked left ureter that is inflamed. I am scheduled for surgery for this problem tomorrow. This pain/ pressure I am having now has been occurring since last night but seems to flare up when I eat. I am beginning to wonder if something is going on with my gallbladder.