Welcome to SR Archives! Good that you want to do something about your drinking. Quitting is probably the best option at this point.
I was 28 too when I quit, 29 now, and I can relate to the escalation of the drinking- drinking more, getting into very embarassing situations, the resulting shame, the physical deterioration. All this was accompanied by high levels of anxiety and insomnia, and much of that was caused by alcohol itself- it took a bit of time, but it definitely got a lot better. It's really worth it, and you can feel better again.