12 week fussiness

My twin B is high needs. Age corrected 12 weeks. Evening has become a nightmare. We try feeding changing, rocking, walking.

Nothing seems to work. They have a lot of saliva in the mouth this past week which makes me wonder if it’s an early teething sign.

I haven’t tried baby wearing in a few weeks. Will do that tmr to calm them down all day. Too late in the night for that now I think? It’s 7:30 pm.

They have been crying non-stop for 1.5 hours. We can’t sit down. Won’t latch. Well drink BM and formula out of a bottle as needed so we don’t think it’s hunger or cluster feeding. There’s something else happening and am not sure how to handle it. Husband and I are at wit’s end. Our arms have had a solid workout and we are sweating. Haven’t showered today.

Any suggestions? I just hope I survive the first year. Is this normal for this time frame?

Thank you.