I'm sorry he's lashing out at you over this Janet. It is usually the ones we are closest to and know will forgive us that we do that to, but it stinks.
You've offered your support, so if you're now feeling like kicking his butt, that's ok too. (as long as you don't actually do it)
My hubby was told that he wouldn't be able to drive truck after his back injury either, and he's been back at it for a year with no problem. So drs really don't know it all. No one will know for sure if he can go back to work until he's had the surgery and PT following it. I'd tell him to use some of that "attitude" to get through what needs to be done and then see where he's at. Men just can't stand the idea of being laid up. ;(