Re: 6.5 month old screaming at breast
My guess is that he's teething. Or perhaps it's just that he's 6.5 months old- it's an age which is notorious for distractibility. Baby nurses for a few seconds- but hey, there's the cat! Nurses for a few seconds- wait, did I just hear the dump truck go by? That thing is fascinating! One thing that can help with a distracted kid is to nurse in a calm, quiet, low-distraction environment, like a darkened bedroom.
You might also want to have him in to the pediatrician and have someone check his ears- stealth ear infections can also cause this sort of behavior.
Based on what you've posted, I'm not sure I see any need for Domperidone. Feeling engorged, feeling strong letdowns- those are generally the product of a mom having too much milk. Most moms wouldn't experience those things that much beyond the newborn period.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"