I had a minor surgery in October,2014 for removal of stone in my left ureter. Now i feel very weak and i have lost 7 kgs weight till date. The Medicine doctor has prescribed me some vitamin tablet/capsules like Immunoboost, Winofit, Vitamin C tablets etc. but still i feel very weak. My hemoglobin is 13.6, Creatinine 1.01, Urea 18, Sugar(random) 98 and my LFT shows normal, RBC & WBC, ESR within normal limits as on 06/01/2016. Please advise.