Pain Under Rib. Left Side, At First Radiating To Under

pain under rib. left side, at first radiating to under arm pit, now 2 months later, radiating to back, under clavicle. Pain 4/10. (Iam tough, 2 knee replacements, shoulder cuff repair. This is becoming unbearable) At first I figured gas....but 2 months and pain is progressing. New onset of 30 pound weight gain as well as elephant feet. Low cholesterol, normal BP. Weight prior to weight gain was 200 pounds, 65 inch tall, female