While I'm still in my twenties. I had a similar experience, I drank perfectly moderately for years. Then I had a health scare and that's when stuff got out of control. The drinking made me not feel afraid for a few hours. So for me the tipping point was that moment. So I don't know, did anything change do you think that meant alcohol stopped being a take it or leave it thing and become something that you needed everyday?
I can only talk from my own experience but that's how it was for me.