I can relate to that feeling of euphoria/adrenalin rush when thinking about a drink, I got that often, my whole mood would change when I've decided to drink. It is so difficult to resist when those cravings strike, but it can be done if you want sobriety bad enough.
I try to remember that those 'good feelings' when drinking are so temporary, and the remorse and guilt (and hangover) last a lot longer.
Exercise is great in early recovery too!