I've relapsed multiple times over the years that I've been struggling with my drinking problem.
I'm not condoning it, but it's also not the end of the world. Treat it as a learning experience - what triggered the relapse, and what could you do differently the next time you feel the same way or in the same situation.
I also don't believe you've thrown away your previous sober time. You had it, so you obviously learned some coping skills, now's the time to strengthen them. Sure you've had a break in continuous sober time, if your counting, but you're not starting from the same place that you were in when you very first made the decision to stop.
Keep us posted on how you're doing.
splitimage
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"I danced in the morning when the world was begun. I danced in the moon and the stars and the sun". From my favourite hymn.
"If you see the wonder in a fairy tale, you can take the future even if you fail." Abba