My son had a stomach virus last week and now...?

He seems back to one hundred percent now and in pre-K but last week boy was he sick :( He could not hold anything down, both ways :( yesterday he ate all his meals and was fine but this morning he drank apple juice and had diarrhea again. Is the apple juice causing him to continue to go diarrhea? Should I just stick to the ginger ale and other juices / water for a few days again? He is also a bit hesistant to eat anything, my doctor said because he was sick and is afraid of vomiting again so he will slowly progress back to where he was. Have any of you mommies have the same situation?