My dad told me to do something that I always do for him, I said "no I don't feel like it". Then he starts yelling like crazy. Whats wrong with him?

Maybe you hurt his feelings because you usually do it.
Or maybe its because you were asked to do something and you didn't have a very good reason to not do it.
Maybe he found it disrespectful.
Maybe something is bothering him  and your rejection upset him.

There could be may reasons for him to react that way.