What Causes Pain Below Left Rib Cage And Left Shoulder?

Question: On XXXXXXX 23 went to bed at 2 a.m. feeling fine. Woke at 4 a.m. with severe chills. Husband came in at 8 a.m. and told him I was sick. Took me to hospital. Had pneumonia in right lung and developed sepsis within a few hours. Procalcitonin was 57.4. BP was 70/50 and had been given 4 bags of fluid without urinating. P.A. came in and had me moved to CCU where a central line was started. Spent three days in CCU and then 4 in regular room. Right lung became much worse. Was given 3 broad spectrum antibiotics thru central line. Went in on Monday. Saturday developed severe left shoulder and arm pain. X-rays of shoulder showed no problem. Went home Saturday evening. Pain in shoulder, arm and hand continued. About a week ago pain under left rib cage began. Have been weak and tired. Sleeping 20 plus hours a day. Two week follow up x-Ray showed significant improvement in right lung. Doctor said just do what I can tolerate. Too weak to do anything. Pain in left upper quadrant just under ribs is getting worse. No fever, O2 is 98%, BP is ok but pain and weakness continue. RBC was low in hospital as was protein. Pneumonia was in right lung. Am 61 years old - never smoked or drank. Have DGD and Chronic Pancreatitis for which I have ERCP with stent exchange every 6 weeks. Had mass on liver (left lobe) when I was 36. Removed mass and gallbladder during surgery. Rerouted common bile duct after gallbladder removed. Mass on liver was hemangioma. Had lost so much weight doc felt sure I had cancer so pulled everything out but no cancer. Did good for a couple of years and then began to loose weight and vomit after eating. Significant weight loss. Was finally sent to GI who did ERCP and found large amount of neurotic tissue and discovered pancreatic duct was also stenosed. Opened common bile duct and pancreatic duct and put stent in Pancreatic duct. Told me the long time it took to diagnose problem and amount of neurotic tissue was how people get pancreatic cancer. The pain from pancreas is more in center of upper abdomen and into back on right side. This pain is higher and on left side under ribs. Pain doc felt they had caused problem with neck when putting in central line. He did a neurotomy from C-2 thru C-5. This has not helped shoulder and arm pain nor weakness in left arm and hand. Procedure was done 10 days ago. Am concerned about pain on left side and continued weakness. Don't know if this is just to be expected or if something else is wrong. Believe pneumonia was caused by aspiration although had not been vomiting. ERCP had been done on Wednesday before got sick on Monday. Docs did not believe it was related to ERCP.
Should I be concerned about upper left quadrant pain or just continue to rest and expect to get stronger with time. Last thing I want to do is go back to hospital.