I also started drinking after 2 months sober. It had been the longest time I'd ever been sober. I felt beyond terrible; I've never forgotten. I was distraught.
But I somehow got the courage to start again, completely humbled. I've been sober ever since. So can you.
Use this as a momentum for change. Do something different. Changing from within was key for me.
Don't beat yourself up. Just move on. Eyes forward!
You can do this. Sending good wishes your way.