It resets a number on the screen, but it doesn't reset all your progress.

Think of it this way: your brain was healing for almost a month now while you were clean. You relapsed twice, but that didn't undo all of the healing ... just focus on getting back on track and not losing any more progress. You can do it!
I definitely recommend making a journal here, by the way. It's been a huge help to me in keeping positive momentum going, even though I've had a few relapses.