Advice for early sleep regression?

Baby will be 4 months on the 21st but hit their sleep regression about 3 weeks ago. I’m exhausted because every night is something different. It literally feels like having a new born again. Before this, he was sleeping through the night and generally pretty happy when awake but now his night routine is all over the place. We still bath, pjs, low lights and feed/nurse but he SCREAMS red in the face the second he hits his bassinet. Sometimes he sleeps until 2am then several wakings between 3-6am. Other times he wakes up several times before 2am. Sometimes he goes back to his bassinet okay in the middle of the night, other nights it’s constant crying. We’ve recently tried switching him to his crib which also has ups and downs. We’ve had to let him CIO a couple of times bc nothing works but everything I read says no sooner than 4 months.

I’m just so tired and his mood Is so dependent on how he sleeps. Also nursing him to sleep is the only way he’ll go back to sleep so husband is useless except for an occasional diaper change.

He does have a tongue and lip tie which we’re getting corrected and hoping it’ll help take a binky.

I’m just tired of nursing to sleep, absolutely HATE cosleeping, from fear and discomfort and just overall at a loss. Looking for the light at the end of the tunnel or someone to let me know it’ll get better bc it feels like we’re going backwards 😭