What are some symptoms of anemia?

I'm anemic but I never really looked into what happens to people with anemia. I have those iron supplements but I don't really take them everyday. =l So I was wondering what happens to people that have anemia? Do they start feeling a certain way when their iron level is low? I also have a habit of always drinking water but it always has to have ice in it so I can munch on. I remember I used to be so attached to eating ice like everyday. I don't as often anymore but still occionally do.