1 year old cries at night😭

Okay, so I need some advice from moms that "have been there, done that." I'm sleep deprived and going crazy!

I can't seem to figure out my son the last few weeks. During the night, he wakes up crying hysterically, with real tears and all. I have tried letting him "cry it out" but that doesn't work. Then he stands in the crib or sits until I come in. He doesn't know how to lay back down in the crib. Not sure why because he knows how to lay down if he's playing on the floor.

We've tried several things...not all at once but little suggestions here and there I've read in books or have received from my doctor.

We thought it was teething and have tried Tylenol and that doesn’t work. I don’t know why a sudden change... it’s driving me crazy because for a long time I’d put my son to be at 9 and he’d play for a bit and before 9:30 he was asleep. I could even walk out the room and finish things up around the house now I can’t even get out of his eyesight without him crying so so hard. And he will stay up until 1am, this is not something I’m used to so it’s been really hard on me especially because my son is actually a twin so half of the time when he’s crying he wakes up his brother then I have both of them crying at the same time 😭😭