I never had a panic attack until I began to abuse alcohol. As I drank more, my hangovers turned into anxiety ridden waking nightmares. My brain was changed after all those years of being pickled. I just wasn't the same person.
However, everything I've been told and researched says that we can heal with sobriety. It may take a few months up to a few years depending on the individual , but the anxiety/panic does go away.
Keep looking to the long term benefits of sobriety!