What can cause upper left sharp pain that radiates to back with vomiting/paleness/weakness? this has gone on for 5 years.

LUQ anatomy: Anatomically, the left upper quadrant (LUQ) of abdomen includes: spleen, pancreatic tail, stomach, descending duodenum, splenic flexure of the colon, associated vessels. Don't forget the diaphragm, heart, and lower chest are pretty close by. The abdominal musculature, ribs, and skin can all contribute as well to localizing LUQ pain. 5-years is a long time to hurt--get checked please.