Day six is fantastic, but it's early days.
I just decided that I was done and nothing would make me waver. Of course I wanted to drink at six days, but I had quit that. Had to find other ways to settle down.
It gets a lot easier the more continuous sober time you have.
I'd never go back now.
Keep doing the next right thing. You'll make it, you're doing great. That post-grad work will be waiting for you to pick it back up. Stay on the beam.