I would be 'wont' to disclose your PN disability to co-workers.
This is a 'no-see-um' disease and is not understood very well
by the general public. It sometimes can create adversarial conditions because they are not able to understand why you have a disability and no amount of trying to make them understand will help. It is difficult enough to try to make spouses and loved ones understand. That's why we come here.
We do understand.
If your principal is not easy to work with, you would have to go
to the school system to be made eligible for application as a part-time worker. You may find that you may not be welcomed back - at the same school.