Oh, dear, maybe you need a break.
I always feel the same as you when i'm stressed, but i believe you'll be okay after you take the things slowly :)

Maybe you could take a break from writing for a while and then come back after you feeling better and want to do it, no need to push yourself to finish the story when you didn't feel like to i think. I believe the reader will understand your situation :)

Take a good rest dear :)