Hi I Have Sever Pain In The Crease Of My

Hi I have sever pain in the crease of my right leg, in the back above the kidney and the right side of my abdomen. I recently put on 50lbs in 3 months, and I cold never gain weight. I also am suffering with leg Edema, severely. Please note I had lung cancer in the right lung, VATS Robotic surgery to remove third of my lung, 15 lymphnodes and the center of my chest back in May, 2013.