Great posts here. Physically, I started feeling better almost immediately after getting past that initial stage of withdrawals and insomnia. There indeed was a feeling of elation after getting past the first few weeks without alcohol. But as others have touched on, I also felt very self-conscious - not only about my past (to be frank I felt very ashamed of past behavior), but also about my present and future.
I guess you could call it a lot of trepidation about how to deal with and adjust to new-found sobriety. A lot of this trepidation had to do with social situations. I quickly realized that I REALLY needed to work on that social piece because I had been in a state of arrested social development for sooo long when I drank. So yes, those first few months were really tough in odd ways.
Anyway, hang in there and congrats on making it to 30!