By all means, hijack! We are here to listen to woes, after all. 
How much milk does DS have in the day at the moment? If you're planning to try him on milkshake, please don't go for shop bought, it's horrifically sugary. If you've a blender you can make your own easily enough with just milk and fruit and it's a hell of a lot healthier.
I think you probably need to sit DH down and have a serious talk with him though. Am I right in thinking you've been doing pretty much all of the night wakings for a year now, while he's had a decent sleep just about every night? The thing a lot of men people don't seem to realise is that sleep matters.
I was talking to the man the other day about this, because I just can't sleep in company. I need space to move; I overheat when there's a furnace-person next to me; if I can hear someone snoring loud enough to wake the dead I can't fall asleep; even if I can hear someone breathing next to me my brain simply won't relax and switch off. So if we do manage to reconcile and cohabit in the future it's going to be separate bedrooms, and that's non-negotiable.
He doesn't like the idea, because he likes to snuggle and feel close to his partner, and feels rejected if said partner doesn't want to sleep next to him. I had to explain very clearly that his preferred method of sleeping means I don't sleep. Why, I asked him, does he think it's reasonable to expect me to never sleep again? It's a very clear example of prioritising his comfort over my needs. Without sleep I don't function well, I'm constantly grumpy, I'm a shit mother because I don't have the energy to give DD the attention she needs. Hopefully he understands now.
Anyway, the point of that ramble is you need to find a way to make DH understand that you need sleep just as much as he does, and the two of you need to be working together to ensure that you both get enough of it to function. If he's not willing to do so, you need to ask him why. Why doesn't he care enough about you to see that you're cracking up through lack of sleep and want to help you? Why does he think it's fair that of the available sleep, he gets it all and you get none? Does he think his need for sleep is more important than yours, and if so, why?
The way I put it to the man is this: I matter just as much as he does. My basic needs are just as important as his. Putting his own needs first to the detriment of mine ultimately suggests he views me as worth less than him. I'm not sure he liked it being put in such stark terms, but trying to be nice and consider his feelings wasn't getting us anywhere.
Gosh, I'd forgotten how long and rambling my posts get when I'm not on my phone!