Why is it in the bottom of an empty jar? Hopefully, you just put it in there for the picture.
Writhing back and forth usually means impending death, but I'm wondering if it's just looking for some leaves to make it's cocoon in. That's the way mine always pupate.
Sherry

It was just in the jar so I could get a better view..

This makes the 5th day it's been acting like this.. It seems to be getting darker and kind of dry near it's head