Oh sweetie hang in there. I'm so sorry you are having to go through this and yes with time I'm sure he will take your milk when he is able to. Well done you on expressing for your wee William it will be so worth it & good for him.
If you need to chat about his birth I'm sure there are others on BB who can share how they coped with delivery under a GA. As you said you fully dilated yourself beforehand & experienced those sensations of birth which are very real.
Sending you lots of love & support,

xx DW