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Reports suggest that there is some inflammation of liver (Hepatitis).
It is difficult to say what has caused Hepatitis. They are commonly causes due to viruses/ some medications/alcohol/gall stones
If you have fever/vomiting/abdominal pain
- you may need sonography
to rule out gallstones/cholecystitis
I feel your doctor after clinical examination must have felt that no further investigations are necessary at this stage and have advised to take these treatment.