So sorry you're having such a tough time :( I wanted to say what Tiktok said already, but far more eloquently than I could :)
Looking for supportive strategies may be the way forward. Slings are fab - maybe look for your local Sling Meet if you're not already using one. Wine is fine - just enjoy a glass in the evening and as long as you're not "under the influence" when you go to bed you're fine.
The only thing I'd be a bit careful of is the smoking which is one of the real red flags for co-sleeping. In a sense it's perhaps worth considering which is the more useful strategy for helping you - smoking or co-sleeping as I honestly would not consider doing both, even if you only smoke, say, in the morning.
You ARE an independent person, but you do have a person who is dependent on you. For now. "Babies will wean, and someday they will sleep through the night. This high maintenance stage of nighttime parenting will pass. The time in your arms, at your breast, and in your bed is a relatively short while in the life of a baby, yet the memories of love and availability last forever." (Dr Sears)
You are not a milk bank, you are a supplier of love, and to your youngest you are a supplier of everything. She's not holding back telling you how much she needs you and just for the next few weeks, perhaps trying to work out how to focus on that will make life easier for you. For your older children a few weeks is far less important than to your youngest and when you get through them you can start to focus on everyone a bit more evenly.
You are clearly a lovely mum to be worried so much, so pull your shoulders back and try to think about all the good things you're doing. It's so hard being pulled from pillar to post, and feeling guilty that you're not doing the best for everyone, but in the end, each of your children will at some time need more focus than another time and it will be the turn of another child soon enough.
Elizabeth Pantley's no-cry sleep solution may be worth a read as she discusses strategies to help babies to learn to sleep without the boob in the mouth. The "Pantley Pull-Off" :) It can take a while but it can really help.
And just to underline the sling thing - if you've not looked into this I really, really recommend it. I used to walk around everywhere feeding in the sling, all the time. It was fine until people pulled it open to "take a look at the baby" without giving me fair notice
. I have a photo of me weeding the garden with DS2 in a sling. I mean, I'd do EVERYTHING except cooking as I was worried about hot splashes. I am good with a back carry for a toddler but not a small baby, but with a back carry I could have done that, too, then pulled him back to the front and back on the boob. Job done.