Hi Dave and welcome
Every time I drank and passed out I would wake a few hours later and be unable to sleep all night.......I would be anxious, heart racing. I spent many lonely nights like this.
Now I am sober I have learned that this is what happened when my blood alcohol level dropped a few hours after drinking......I was having withdrawal symptoms - that had never occurred to me.
Now I am sober the anxiety has gone and I am sleeping again.
The problem with a big panic attack is that it can make you feel frightened just thinking about it. When you feel frightened you produce adrenaline and that makes you anxious, then you produce more, then you start to have a panic attack and then you really are pumping adrenaline and you feel like you are going to die as it races through your body. Alcohol affects the nervous system and just makes this worse.
I got sober using the 12 Steps of AA. Have you thought of going to a meeting?