arm pump isnt a pain, its just a feeling (numb hands).
Could it be your riding position? If I read your first post right your on a new frame? This might put you in a different position to what your used to. Having a break wont resolve it as when you get riding again you will still be in a different position to what your used to.
Possilby try setting your bike up a little different to see if that solves it, or just carry on riding to get used to the feel.
(if your not on a new frame you should probably ignore all that (Y) )
actually, I re-read your post, I get what you mean now, silly me.