Welcome to SR Formyself. I relate very much to you post. I suffer with anxiety too.....it is so much worse when I drink. You may or may not need help once you get sober to sort out the anxiety.
I am only on day 64 but have managed 6 months sober before. I can tell you my anxiety was greatly reduced by 6 months and was not the main reason for relapsing that time. However I have ofter gone back drinking after a month or so because of anxiety......I have learned you need considerable time sober before the anxiety lessens (at least thats my experience).
One of the best things about not drinking is that all that guilt and shame lessens dramatically. To me that is priceless.
Maybe consider joining the December support group....that way you can make this step with others who are in the same boat. It really helps.
Best wishes to you.