Crazy Days

So I have been having some serious issues with Nathan lately. He has officially entered the tantrum stage, and I have no idea how to get it under control. He will scream at the top of his lungs if he wants something and doesn't get it. Sometimes he will run away from me and throw himself on the floor, and other times he will start banging his head on the closest surface. This one really worries me, because I don't want him to hurt himself. He'll bang his head on the floor, or the back of his high chair, but after he does it he wants sympathy because now he is in pain. What do I do about this? I know he gets frustrated because he can't always communicate what he wants, but this is OUT OF CONTROL! He is great when he is getting one-on-one attention. If I am playing ball, playing cars, or reading to him, he is usually okay. But it's hard to do these things all day... I know I'm not as good a Mom as I should be, and I have a lot to work on, but I'm really not sure how to do it all. I constantly feel guilty for wanting to spend time on other things. I always try and run on the treadmill every morning, which means Nathan is watching a movie. I would love to spend more time scrapbooking, cleaning, sleeping, and reading. And I know I spend far too much time on the computer. I love Nathan more than anything, and I have a hard time leaving him... even if it is with Jon, but sometimes I reach my limit. I did feel a little bit better reading a friend's blog. She had articles about the importance of being a mother and our divine role. I probably need to study a little more to help me straighten out my priorities. If you have any other suggestions... feel free.