I'm not sure if I have welcomed you to HW yet, so welcome! I was diagnosed with panic/anxiety disorder when I was 17, so I have "officially" had it for roughly 17 years (wow!). I did suffer from night terrors as a child though so I would say I have had it most of my life.
I have, during this time had long periods with no attacks at all, and I rarely get them now. Do you take any meds or have treatment for your panic? Take care.