I am sorry you are feeling bad again
I have of pain under my left rib and it's caused from costochondritis which is inflammation in the cartilage between the ribs, it can also pop up in the breastbone, which is quite painful. Mine is usually painful when I am flaring and feels like a knot and is painful to press on. The first doctor I told about
it which was only a GP said it was my floating rib..............LOL!!!!!!
Please let us know how your appt goes.