Welcome to the forum! Here’s some more info that might be helpful to you, along with the wonderful responses you’ve had already 
It is really common to get a bit wobbly around milestones. Remember it is just another day, keep doing one day at a time.
For me, really holding on to the bad stuff about drinking, the things I did and how it made me feel, has been so helpful. If you find yourself thinking about a drink, play the tape to the end… What really happens? For me it was usually some combination of blackouts, saying and doing things I regret, overspending, anxiety, shame, etc.