Rapid weight loss, chronic weakness and protein in urine is signs and symptoms of uncontrolled diabetes. So we need HBA1C, Fasting and PP reports with serum creatinine, urine albumin. Also check his TSH level. All reports must be latest. So check with good laboratory or pathology. You should consult to endocrinologist or Diabetologist. Also tell him to go for fundus examination by ophthalmologist. He is just 55 yrs so proper care will prevent complications. Good luck. Wishing him good health and better recovery.