How to get a baby off the boob as a pacifier?

My baby will refuse to sleep without having my dear ladies as a pacifier! He is nearly 3 months old and just developed this habit recently. It's been hard leaving him to the babysitter or my boyfriend. He screams shortly after I leave and will continue to for hours (nothing wrong, diaper changed, fed, etc), and will just scream himself out to the point of falling asleep. It's getting very upsetting and I've tried pacifiers, so many different ones including his favorite soothies but they just don't work! Ah! any suggestions? 
Edit: he will also scream when I'm with him until I surrender one of my girls for him to suck away on. 😕 because of this he also ends up spitting milk up a lot, and sometimes throwing up a bit later. 
Another edit: i also forgot to add that eventually when he does calm down, and he hears my voice when I get back home, he will instantly start screaming until I give him a breast 😕.