It was in my late 20's that my drinking progressed from social drinking/bars/nightclubs 2-3 nights a week to drinking alone during week every day after work. My hangovers and anxiety from the weekend binges got worse and worse where I didn't feel normal for days after. So I drank to alleviate the anxiety on Mondays, then the next day and the next. Soon I was anxious all the time and the only relief came with more alcohol.
The anxiety was all brought on by the booze. I was never really sure what I was so anxious about. It was just a general feeling of dread that only went away with more booze.
Cut out the booze and you will see an improvement. Alcohol abuse wreaks havoc on the brain/mental health.