"The video opens with Davis recalling, “It was the most horrible thing — I remember when I got my first panic attack, I thought I was gonna die.” The rocker recounts how he was drinking heavily and very much into drugs at the time and it led him down a very dark path. “I started getting really paranoid thinking medicine was bad for me and stuff like that. I wouldn’t take any kinds of meds and I actually turned schizophrenic for a while,” says the singer."
http://loudwire.com/korn-jonathan-davis-depression-anxiety/
I think is stands for panic attack:
"The video opens with Davis recalling, “It was the most horrible thing — I remember when I got my first panic attack, I thought I was gonna die.” The rocker recounts how he was drinking heavily and very much into drugs at the time and it led him down a very dark path. “I started getting really paranoid thinking medicine was bad for me and stuff like that. I wouldn’t take any kinds of meds and I actually turned schizophrenic for a while,” says the singer." http://loudwire.com/korn-jonathan-davis-depression-anxiety/
Atmosphere - Panic Attack (The P.A.) http://genius.com/Atmosphere-panic-attack-the-pa-lyrics
"That one of the worst PA’s I has ever had I would say I went into shock." https://www.quora.com/Can-panic-attak-cause-paralysis
You will find additional sources, where panic attacks are referred to as PA. Especially among patients who suffer from this symptom.