As your gall bladder
got infected and removed under General anaesthesia
,it is natural to have weakness and tiredness post operatively.
Please take good antibiotic like Cefuroxime
and anti inflammatory drug.
Take protein diet,green leafy vegetables.Eat frequent small feeds.
Diarrhoea can be due to infection of bowels caused by contaminated food or water.Please take Pre and probiotic
if it continues.
Please keep your blood sugar levels under control.
Wish you good health