That's odd that your doctor wants you to stop pumping...I'm pumping when I can to try to get a solid milk stash in the freezer for later. But like MrsB I only bottle feed if he wakes right after I've pumped down both breasts AND I've already tried him on both to see if there is any left. He doesn't care for the bottle though.
I know a lot of people are concerned with weight gain and such but I really don't find it that useful of a tool for gaging how baby is doing. A baby shouldn't LOSE weight, but as long as they are gaining, I don't see the harm in trying to EBF and wean from the bottle. Maybe clarify with the doctor why they want to do that? Lots of women EBF from pumped bottles and their babies do fine.
Foxy: All I can say is that DH was the same with my DD. I was BFing though, but he was useless at night even when I'd kick him and tell him to wake up and change her so I could get some sleep (as I was BFing all night!). I think that you need to just talk to him and tell him he needs to take the midnight feeding. Set the alarm clock and tell him he needs to wake with the alarm and feed the baby and that you will wake for the 4am feeding. There really is no reason he can't do it. But I don't think men understand how exhausting it is to do all the changing, feeding, rocking, holding, etc. at night. It's not like you've been comfortably sleeping for several months now!