ankle edema,rapid weight loss and gain...HELP

[Mr.Wise]

Does anyone have any suggestions? I am a 45 yo in shape guy. Still recovering from severe car accident 2 years ago. Severe concussion, seizures, broken sternum, ribs, vestibular damage. History of ACDFC5/6/7/8, Hand reconstruction from accident, migraines. HIstory of 50 plus kidney stones with 3 or 4 lithotripries. Over past month experienced for first time swelling of ankles with severe pain in legs from knees down. Lasted about 4 days and went away as quickly as it came. Two weeks ago same thing..confirmed on my scale and at doctors (170 pound pretty fit guy) ankles swelled up with pain and gained 10 lbs in one day...last several days and lost 12.5 lbs overnight. Do not appear to have any increse in urination. Venous doppler was negative, blood work was negative, no change i diet during period. Did xrays for rheunatoid arthritis..negative. Cardiologist said things look fine. Supposed to get CT scan of abdomen and pelvis. Have history of over 50 kidney stones mainly about 10 years ago (4 lithotripsies). I know I had some small calcifications on both kidneys about a year ago but have not followed up further as been so consumed with other injuries from the acident. Severe pain from knees down....any ideas? doctors say that much weight loss is impossible but they confirmed on their scales...been on a lot of medications but no change recently...appeciate any thouhgts? Thank,