Sounds like some spasms happening.
I think prop and rest the muscles as much as you can for now.
extra pillows, recliner etc.
Maybe some very easy slow relaxing stretches to keep range of motion and fluidity ?? Is that a word LOL. I think it is...

It might take a couple of weeks to calm down depending on how bad it is.

Are you seeing a PT or chiro that might be able to do some specific massage for it?
might need deep tissue type massage or TrP type massage if rest and relax doesn't fix it.