The following is posted for a friend without a Stack Exchange account:
I recently had an interview for an organization I deeply respect. Because of how much I wanted this position, I was rightfully nervous; but I didn't think too much of it. However, in the middle of the interview, I started shaking and having difficulty breathing, hearing the questions I was being asked, and speaking without stuttering or losing my breath. I ended up performing so uncooperatively that the employers had to terminate the interview.
I've had anxiety attacks in the past, but not frequently and certainly not of this magnitude; and I didn't get a chance to process and recognize what had occurred until I had already left their offices.
I'm not looking to pull any heartstrings and manipulate the organization into giving me a second chance. I'm coming to accept that this is probably not a possibility. But I would like to somehow apologize to these people who, before the interview, had been genuinely interested in hiring me.
What is the etiquette for such an apology letter? What should I say and how do I word this appropriately?