I'm sorry you feel this way - it's horrible not wanting to return to work (beyond what is considered normal).
Is it the particular school you are in? If so, would working towards changing schools help? There are great schools out there so if the one you are in isn't right, it's worth looking elsewhere.
Or is it the job itself? If so, that is more complicated but you could make a list of your skills/experiences and look at relevant roles - maybe civil service/local council would be a good place to start?
In the short term, what would make things slightly easier next week?
I like to be well prepared- if that would help, maybe set aside a couple of hours to get organised for your first week back.
Plan something nice to do for this Sunday to avoid the back to work anxiety or something for the following weekend to look forward to.
Something I do, mainly due to having generalised anxiety, is each day, I note at least one positive from my working day - it might be small but there will be something.