Please help... advice needed???

My 4 month old son just seems to be so bad tempered and spoilt! I know it probably sounds ridiculous but its really getting me down. The past few weeks he just demands constant attention. he screams when i leave the room.. even to go to the bathroom. He gets himself in a right tiz and as soon as i lift him he's fine! I can't get my housework done unless he's sleeping, which isn't often and even then i'm afraid to turn the hoover on incase i wake him! I do most of it when he goes down for the night but by then Im so exhausted. I know other peoples children aren't like this and I've always tried to make sure he isn't spoilt. I can't let him cry it out cos I haven't got the heart. Please help me.. Any advice greatly appreciated. Im so down about it all. Thanks x