I've been an employee for about 2 months now. I am a loader that runs about 450....building 8's I guess w/e. I keep getting a strange pain in my arms on heavy days... It doesn't bother me at work so much, it's the worst when I am trying to sleep. It is a stabbing pain up both my arms (mostly the right). I have notified my sup several times now(he seems indifferent). My only guess is the motion I make with the scanner. I assume this is very common and I was wondering if anyone had any kind of exercise sort of thing to help it out?