It's so amazing that you are managing to keep moving during this and show up for work. That's a miracle right there. I don't know how much you have told your supervisors, but maybe at least you can give them a heads up that you are recovering from an illness and may need some time off, so that if you can't show up one day they'll be prepared. I know this is tricky when you have a job like teacher. But at least it might eliminate the dread that you are going to be fired.

Are you in therapy? Can you talk to your therapist about how things are going?