Was Fired Yesterday For Something I Did Not Do. Please Help Me

I am in the U.S. and I don’t know what to do. I’m so overwhelmed with this whole situation and I feel very suicidal right now. I am seeking legal advice on whether I was wrongfully terminated or not. I work in healthcare and was fired yesterday for “Gross Misconduct – Misuse of Company Equipment or Violation of Company Email/Social Media,” following an investigation into a xenophobic email sent from my supervisor’s account.

Despite no evidence linking me to the email, I was the only employee placed on leave and later fired—while my boss whose account sent that email was not put on leave and were able to remain at work and were never formally investigated.

Then, during the investigation interview (which was done over Google Meets), I was asked if I noticed anything unusual on the day of the incident. I mentioned that during a clinical staff meeting, my supervisor’s camera & audio was on and they were in a grocery store discussing their client’s information while shopping in public- which is a HIPAA violation. I also mentioned the fact that I felt very disturbed by the xenophobic email that they sent as I am an immigrant myself (and one of the only POC’s in the office). After I brought this up, my leave was extended.

HR was not present in the Google Meets investigation meetings. The investigation was led by a longtime personal friend of my supervisor, and my coworkers later informed me that they (my supervisor and their friend) stayed in the office and were accessing my work computer after office hours. There is no concrete evidence of IT login records that proved I accessed their account or sent the email.

Do I have a case here?? Please give me some guidance. I appreciate any advice, I don’t know what to do. I’ve been crying and puking since I got fired and I just cannot believe this is happening. I’ve never been fired before

Edit: Called an employment lawyer near me and they said that I don’t have a case since we live in an at-will state and my work can fire me for anything and any reason. How is that possible? I didn’t do anything wrong. I don’t know what to do, I’m so tired I can’t do this anymore