Panic attacks alone are enough to cause it. You're in a constant state of sensory arousal so it makes sense you'd be hyper-vigilant as well. And it sounds like you have triggers with the ACOA stuff. Has your T made it back yet? Have you considered getting referred to CBT and/or an anxiety disorder support group? It really does help to be around people who understand. I know for me, it takes some of the paranoia out of it because I know I'm not the only one who experiences it.
Of course you've always got us too.