I also had my first panic attack when being hungover. That was in 2004. I thought I was going insane and/or dying. Yet I continued to binge drink for another 9 years and suffered many more panic attacks as a result. Every time I drank I would spend the entire day after in bed and in the bathroom... Sometimes on the bathroom floor. The psychological and physical effects of drinking only got worse. I always felt as if my heart was coming out of my chest.
My worst hangover was when I woke up in a hospital bed with no memory of what had happened the night before. I thought that was when I hit rock bottom. It wasn't. It is scary how much we are capable to suppress in order to allow ourselves to drink. Ten years ago I couldn't have imagined I would have continued drinking after getting a blackout while on a flight, not even remembering how I got through customs and back home. It took me a year to get here from that point.
The worst were the feelings of guilt and shame. I still struggle with those.