Just an update for anyone interested.
I ended up with a Licenced Professional Councellor. I've had 2 sessions and am already turning my life around. It seems that a lack of self confidence has been a major contributor to my anxiety so I'm doing some activities to build that up. I'm already feeling more sociable and energetic. Anxiety is still an issue, of course, but I'm getting out of the house a lot more and have made some new friends. And being more socially active has been keeping my mind off drinking. I still have a way to go to build the life I want but I'm moving in the right direction.