Teaching is like 200% stress....I did it for 30 years. Anything on top of teaching is hard. I agree with the vacation day idea. Be easy on yourself. This is the hardest part. One bite of the elephant at a time....1 inch of the football field. This too shall pass. You are going to get through it. Your child will be better off. R and r as much as possible. Eat right and try to go for a walk to get those endomorphins going. My therapist got me taking 5 HTP to get my Seratonin right and to help me rest.
It hurts and it is sad but you are taking positive action. Sometimes when we already have a bucketfull one more drop is too much. It will pass.