E.W.
M.
Right now and perhaps even for a few more months or more, screaming is his only means of communicating...therefore give him other tools, he is at the perfect age for learning sign language....you can find easy to follow ASL for baby books at your local library or get a dvd too....or make up your own signs for words like "more" "down" "up" "again" and then YOU use these signs everytime you say the word out loud. He will catch on and with your excited response to his trying to sign he will be even more motivated to try and do them, hopefully with this it will decrease his frustration of not being aboe to communicate. The goal here is a happy baby and a happy momma so don't ignore his requests right now instead replace the negative behavior with a positive one that causes you to show him of happy this makes you....once he catches on you can then totally ignore the screams and this too shall pass.
good luck
E.