What Causes Yellowish Discoloration Of The Eyes And Skin?

hi, my son is 2 years and half, and he had yellowish eyes and skin and browny urine, we took him to hospital and they make blood test to him , they foun the enzyme level is little bit high not the risky level and the hemoglobin are good level , they told us to go back home and give him a lot of fluid to flush , but the children is always tired refuse to drink he ate little , his stool is mustard color and urine has changed from brown to yellow than brown today , I am scary and worry about him he had it from Friday , what we shoul do what we can help him , until when we must wait to take him hospital , he is like sleepy , , he is not himself