18 month old multiple wake ups every night, up early morning, crap naps. I’m going insane

I’m writing this at 3:30am. I’m at the end of my rope and don’t know what to do anymore. This is worse than having a newborn. My 18 month old’s sleep has become absolutely horrible over the past couple of weeks and only seems to be getting worse. I know there is a 18 month regression but it has never been this bad, and it has been like this for weeks and weeks.

She does not sleep through the night anymore, instead she wakes up screaming multiple times every night, and every time it takes an hour or so to get her back to sleep. She will only go back to sleep if I (not her daddy, it has to be me, otherwise she’ll keep screaming) pat her back until she is deep asleep, which often takes over hour. If I stop too soon she will start screaming again. I’ve tried doing Ferber-style check ins, but she just keeps screaming the moment I walk out and would probably scream for hours.

She is also up for the day every morning between 5 and 6, after around 9h of sleep, and is therefore cranky all day. Naps are also a shitshow. Fights every nap and wakes up after 30-45min.

I don’t know what to do anymore. Nothing in her routine has changed. I am so fucking tired and angry. Please advice. Here is her schedule before she started waking up super early:

Wake up: 7:30 Nap: around 1 (for 1-2h) Bed time: 8:30

Now: Wake up: 5-6 Nap: 12ish (for 40min - 1:20, with me usually having to go in once to get her back down, unless she’s at daycare) Bed time: 8-8:30

Thank you.