I have the same problems which is why, in situations like this, I will tell myself that I just don't have to drink today. This makes it seem less like an overwhelming uncertainty, making assumptions about the future. It puts things into perspective again.
I don't know if I drink again in the future. I don't know if I change my mind or forget about things. But I do know that I won't drink today and that's all that counts. Because today is all we have anyway
I know this 'one day at a time' is more of an AA approach and I struggled with this one in the beginning. But over the months I found it to work best for me.
And until I might feel comfortable to say 'never ever will I drink again' at one point in the future I'll go with just not drinking today.