Hi Dr Utkrisht You mention two unsolved problem. First is hepatomegaly which require complete evaluation by a gastroenterology and second is contracted rt kidney. If there is pain arising from unilateral kidney than always rule out renal stone, infection and in rare case malignancy. In doing so we need complete evaluation in the form of urine examination, blood investigation including renal function and CT KUB under nephrologist guidance. For pain relief we have to start pain killer including antispasmodic. Hope this information will be useful for you