I had patient who made my life living hell for 12 hours, who lied at every turn and manipulated everyone. Still, I did my job and well. A complaint was emailed to CEO and now it's a circus. I know I did nothing wrong, why does it feel like I did?

Try not to feel guilty. It just adds to the stresss.You didn’t mention whether you told the supervisor about your patient. Stick to your principles. If they fire you for something you didn’t do it’s their loss. You don’t want to work for them anymore. I had a nurse that just hated me, seem to think I undermined her. She took it as far as peer review which voted for my side. I did walk out after the meeting was over.