My late husband helped me with that. I was clean/sober too and was subject to having panic attacks - and didn't want to take meds!
He told me to ask myself: "What's the worst that could happen?" Ask yourself this when you're feeling like you're going to have a panic attack.
I would ask myself this, and think it thru. The worst that could happen would be (for me) that I would faint, someone would call the ambulance, I'd be taken to the hospital, and it would be found that I fainted. Big deal. I could handle that. That's NO big deal.
So what's the worst that can happen to YOU Bitten?