What Causes Stomach Ache After Taking Norflox?

Hi,My age is 44 and my weight is 69.I was having a kidney stone of 18mm and i had a surgery for that two years before and that stone was removed but after the operation my health is not too well.I am mostly having stomach problems and have fatty liver also.I am taking medicine for that in which one medicine is Norflox-400 but after having this tablet i don t feel good.I feel bit of pain in my stomach.Please suggest me should i continue this medicine and also some tips about my diet .