Oh dear. While this may not be a single great catastrophe of earth-shattering proportions, it truly sounds bad enough to me. Poor you. :(

As for your manager... That sounds like bad tactics, at the very least. Someone who makes their staff feel that they do not matter at all is asking for bad situations.

And I sympathize about having a teacher in the house shortly before the summer holidays. That is an especially stressful time for teachers everywhere in the world, I believe.