It seems that the word addiction has come to mean so much more than what the word probably originally meant: Something that we are powerless to stop or deal with.
in that sense, I'd say that it is possible to find some relief or comfort in the effects of anxiety. As a teen, I used to "enjoy" saying things to my dad that would tick him off. He, in turn, would say something that would burn my butt-but I knew i could say something that would just continue the circle.
Kinda childish on my part, but I was angry with him for a few reasons.
So I suppose we could feel that we were powerless over the anxiety, but the thrill of the pumped up feelings were somewhat (and strangely) empowering.