Danni, I've had days exactly the same, and seriously thought I would go insane.
I ended up sitting in my recliner, watching McLeod's Daughter's DVD's for about 3 days straight. I just breastfed, then let Jambin fall asleep in my arms, breastfed again etc etc. The only time I got off the chair was to change his nappy (and I had unhealthy snacks beside the chair - sometimes you've gotta give up the idea of eating a healthy lunch).

That doesn't really solve your problem of getting Mason out of your arms, but if he's having a day like that, it might be easier to go with it, rather than fight it, IYKWIM.

It's bloody awful, I know. I hope things improve for you hun.