If you get called to the jury box during jury selection, ask to speak to the judge at the bench and tell the judge you have anxiety and that it would prevent you from being able to follow the proceedings and evaluate the evidence. It would be the truth and should be sufficient to get you dismissed from the jury pool.
I was dismissed from a jury pool for a very similar reason. My coworker had been shot (he lived) three days before I reported for jury duty and I couldn’t concentrate on the proceedings. The judge and both lawyers were like, “you’re out of here” and that was that.