I've given too much information about my health, and now it gets used against me.
Your employer, managers, supervisors; they're not you're friends. You can and should remain friendly to an extent, but be careful what information you give away.
How does it feel like that has worked against you? [How could anyone possibly weaponize this [unless the non-profit is like Burning War-Orphan Flags and War-Orphans of America or something]?].