I get sharp pain in left, upper abdomen and back followed by days of fatigue and dizziness. many tests (incl. hemo) show only enlarged spleen. ideas?

This is something: You and your doctor to take is seriously . I do not know what tests you have so far , but i will encourage to keep your doctor informed about your situation . I believe your doctor would consider evaluating your kidney, pancreas and look for any problem in your left side of the colon and many others . In general , your condition is something that you need to work closely with your doctors. Good luck.