I haven't yet been fired from a nursing gig, but I was unjustly fired from a previous "dream job." I gently called out the bigoted new CEO from out of state on her extreme transphobia (mind you this was at an LGBTQ youth center). She came in like a monsoon and behaved in a way that went against all the tenants of the literal contract we all signed agreeing how to treat one another as coworkers. It was hurtful and damaging. She wanted a top-down kind of leadership that did not fit with the long history of the organization. However, since I was still in my probationary period, I was fired the next day. It stung, but my confidence was bolstered when my supervisor walked out with me in solidarity. Even so, my confidence was badly shaken for like a year afterward. I felt insecure in unfamiliar ways. So I completely can commiserate with the second guessing yourself that can come with being fired.
Ultimately, that same new CEO drove the center into the ground, and it ended up closing just 6 months after she came on board, despite efforts for the staff to unionize. Another casualty of the power-hungry.