Someone help me please

My youngest refuses bedtime now and screams like she’s being beaten before bedtime. She went from screaming only a few minutes to screaming for about An hour or longer each night. Once she finally settles she starts to scream all over again. I don’t know what to do and now it’s effecting my oldest ones sleep.

I need advice or some words of encouragement please 😭😭😭😭😭😭