How to calm down panic attacks?

Panic attacks are said to be 'seemingly random'. I suffer this anxiety disorder as well. Think of it as those porch lights that detect motion and light up when someone walks up your drive way. If they're set too sensitive, then they'll go off at basically nothing, or things that you yourself don't observe. If they're not set sensitive enough, then you can just never get them to go off. My therapist said that sometimes things occur that we are unaware of or subconsciously. It could be a noise, a picture, something you may not even know setting you off. During a panic attack just remember to stay calm. It's experiencing the same kind of adrenaline one would have on a roller-coaster, only its unexpected which seems scary. Stay calm! Personally, when i first get that feeling in my chest and I know an attack is coming on, I get that 'oh no!' kind of attitude. Saying 'oh no' or being scared or nervous are anxiety provoking thoughts, therefore creating a never-ending loop of freaking out. Mine skip around a lot. Once I had about 3 panic attacks in a weekend, then didn't have them for two weeks. Once again its very difficult to determine what sets them off since they can be 'seemingly random'. But that's the key. Seemingly. Just remember to stay calm and breathe. Hope that helped.