Hi, I am 56, average weight (57kg), 169cm tall. Lately I had several occasions where after drinking green tea or water I develop belching and severe dull pain in my left kidney area, sometimes lasting for 2 days. Often it is when I twist my torso or do anything just after drinking. It is not indigestion - it is usually on empty stomach. Could it be something with my kidneys or pancreas? I am taking pancreatin for digestive problems. I also have sliding hernia and a host of other problems, but this is a new one.