I'm sorry this is happening to you right now. Stress can indeed hamper your milk from becoming fully available.
Make sure you're trying to feed in a comfortable, stress free (if possible) room at least, and as has been said, drinking as much as possible.
Sleep when the baby sleeps, if your hub isn't doing household chores they'll just have to wait. Taking care of the baby and yourself, is paramount.
Do you have anyone who could come help you? A good friend you could call to come sit while you take a shower, or a nap?
You've had a C-section, you'll need your rest to build up your strength and its not unusal for your milk to be slow after a section.
I hope your hub would be able to see the help that you need everyday and not sporadically.
(())
CiF
ps, all babies loose a little weight after birth, and it's also very ok to supplement with formula if you have to, don't beat yourself up for that