My seven week old has suddenly stopped sleeping good at night. He was doing great,then I had to spend a few days in the hospital and since then he won't stay asleep. He'll go down for 40 minutes tops then he's up screaming until he sees me. Also he wants to eat constantly, like every two hours. He was a big baby, and the doctor recommended ginning him a little water at night when he's doing these constant feedings. Not saying he won't get formula at night, but just to add a bottle of water too. Any thoughts?