Praying for your wife.
Sounds like the exact same symptoms my wife has been having. We spent a night & day in the hospital thinking it was heart related. They did EKG, heart monitor and treadmill stress test in the hospital and we were told it was not her heart.
Now they are looking at GI issues. She doesn't have a gall bladder as it was removed 3 years ago but Dr. is thinking she may have a leftover gallstone somewhere that may be causing her issue.
My wife has been sick since the end of November and we still don't have any definitive answers.