I have to say your husband's response will not help you stay calm. Ir, you'll have to keep it together because he's fallen apart.
If your child is deaf, they will be fine. Different, but fine. Or he may have excellent hearing and be completely uninterested in music!
I don't understand about your son's namesake - is this a baby you had, or a relative/ friend's baby?
Maybe you need to choose a name that doesn't bring so much emotion with it? It's a lovely idea, but it's the kind of decision we make before we have a real live baby in front of us who can get sick, and have their own "journey" or challenges of some kind.
If your dh is going to refer back to the previous baby at times like this, it will make life hard for all of your, not least your son.
I'm not being insensitive, I have a very similar experience.
Meanwhile, just to reassure you, staff will constantly ask if this is your first baby. Some of them might be diminishing you, but most of them need to know for other reasons; how much you already know about babies, if you've had a pre-term baby before, if there are other children in the house.
It will happen for the next 18 years 💕
Well done with the feeding, and try to keep your cool. You've had a very rocky start, but try not to let that colour everything, going forward.