It’s hard OP - all these suggestions of 5-6 hour blocks of uninterrupted sleep just aren’t practical or realistic when you’ve got a breast milk supply that needs protecting and the risk of mastitis to avoid too in these early months.
I EBF my children too so I understand the pressures of doing all these night feeds and how exhausting it is, and it’s definitely worse when it’s the second baby and there’s a toddler to attend to as well so it’s not a case of just being able to lie-in in the morning.
Me and DH shared a room when it was the first baby and although I was up doing the feeds, he would so all the nappy changes and re-settling. Just having him there for the emotional support and the company really helped when I felt like I was on the brink of collapse.
When it came to Baby number 2, we did have separate rooms but that’s because I would then take on all the care of the baby overnight, whilst he’d sleep and then get up with the toddler overnight if needed (without us disturbing each other), and in the morning he’d get up in the morning with the toddler at about 6am and get him dressed and fed etc and entertain him for a couple of hours before going to work, so at least I had those few hours of respite, or a few hours of being able to get some extra sleep.
This phase of new parenting is exhausting and sadly for babies who are exclusively or primarily breastfed, the onus does lie on the mother to either be up feeding, or needing to get up and pump, and it’s hard work but also just the way it is.
What used to really help me was that when DH came home from work at about 5pm, I would BF the baby abd then I would go for a 2 hour nap whilst he tended to the baby and toddler. Just having that Power Nap and time away from the children and the noise gave me such a boost in my energy levels.
Also, before he welt to work he would always make up a packed lunch in the fridge for me and the toddler so I never had to worry about finding time to make lunch. Just having that one job already done lightened the mental load a little, which made the tiredness during the day just that little easier to bear.
It’s easy for resentment to start setting in, so it’s just about identifying little things that your husband can do to help lighten the load of the rest of your day.