It affected the tail of my pancreas and I have similar symptoms, such as
pain in the left side under my ribs that radiates to the back, discomfort
in my upper stomach and it hurts to lay down. I also have had problems for years with diarrhea right after a meal. When I had this 6 years ago I didn't know what it was but I would definitely have your doctor send you to have your pancreas enzyme levels checked. If they are elevated, you may have pancreatitis.