I really hope you are still reading, so much good advice.
Agree you are at such a low sleep level now that you need to think about breaking your own rules, formula and pacifiers and not the horrors they are made out to be. They can be useful tools to support breastfeeding. Don't let snobbish attitudes get in the way of you helping yourself and your son.
Once a baby is full, a pacifier can be a real help. It's not the same as it was in the 80s/90s, advice has changed. I was also against them but 'gave in' and never looked back. My mother raised her eyebrows a little (she was mostly v supportive), but then again both her children sucked thumbs/fingers - my sister still does, none of my boys still have a dummy! If they are sucky babies they'll find a way.
And please don't compare to your sisters experience. Babies are as unique as us adults are and each need their own tweaks to thrive. Yours might have a tongue tie, he might have reflux. Mine had both, my sister's didn't. My sister's babies suffered with ear problems, mine didn't. There is no one size fits all.
Lastly, please make sure you eat well and rest, even if not asleep. The adults around you have one role - it is to provide you with food and drinks and support you with the essential practicalities such as laundry. You just need to recover strength, and focus on you and your baby.
My lovely mum used to say to me "he's your baby, you know best"...this infuriated me slightly as I was clueless! What I later realised was she meant "he's your baby, these are your decisions to make"
I wish you well. Deep breaths, make some decisions. X