This is such a heartbreaking thread... I'm glad to hear you had a good weekend! I can only imagine the intense emotions you're feeling, and admire your stamina and patience, mama.
My only thought, which I didn't see mentioned here, is that perhaps he has a problem with the flavor of your milk - not because there's anything wrong with you, but because of a sensitivity to your diet. I've heard that something like 40% of colic is associated with lactose intolerance - babies who can't handle any cow milk products in mom's milk. Not sure if this would be at all related, based on his behaviour, but thought I'd put it out there.
Hang in there!