Help! Weaning my 18 month old

To say hes addicted to the boob, is quite an understatement. He says boob and cries for it and lifts up my shirt if I won’t give it to him. He’s stuck on it all nap and all night when he’s sleeping and gets mad when I take it out of his mouth and won’t go back to sleep till I cave and give him the boob. I’m in the first trimester right now and I can’t do this anymore 😭. Someone help please. I don’t do the cry it out method well. I am too sensitive and hate seeing him cry. He also does not like any milk I’ve tried given him. I’ve tried a few different kinds and he won’t drink it.