Exhaustion while doing dishes/cooking

Stacie • Mother to Ben 👦🏽, Bash 👦🏽, and Braxton 👶🏽, 420 enthusiast 🔥💨, lover of life 😍🤘🏾
I've noticed recently that Whenever I'm standing for longer than 2-3 minutes, my back and belly starts to hurt and my legs start to wobble.
I try to sit down between a few dishes and while food is cooking, but getting back up is a hassle and I would rather stay seated.
I have no idea how I'm gonna make it for Thanksgiving as I will be doing most of the cooking.
Anybody have advice on how to make it thru thanksgiving without my legs giving out on me or my back giving out on me?
I'll be 23 weeks on Tuesday.