Diarrhea and Lost Appetite in Toddler

My son who next month turns 2 years old has been having diarrhea and don't want to eat since last Friday night. He drink his milks but I heard that cause more diarrhea in him. He cranky too which make me more stress as he having diarrhea, don't want to eat his meals ( been offering all kinds of foods) and his crankiness. Is there mummy who gone thru this and what the best solution?