I don't know what your pain is but I have been experiencing something similar.  I too have acid reflux, also a hiatal hernia, and have had my gall bladder removed.  A year ago, I had upper and lower GI scopes and dilation of my esophagus to help with difficulty swallowing.  Last weekend I experienced a bad pain in my left side, almost like someone had punched me.  Since then I have had one day where I couldn't keep food down, I visited my doctor who did xrays to see if my rib was broken, and results came back normal.  I have had twice since then that I had sharp pain in my left side just below my ribs.  I have also had back pain this week, with no reason to have any kind of injury.  I am sure it is related to my other medical problems.  So hopefully, someone can answer the question for both of us. 

All in the same path for a while having the same pain.. I was told it was gasses.. It feels like butterflies and pressure with inflamation and pain at the same time.

I have notice that anything with milk crates this pain for some reason.. Sometimes cheese, creamers for coffee gives me pain... right on the left hand side of top area of stomagh...