Consider yourself lucky, because it is hellish! And even dangerous. For instance, I cannot quit drinking cold turkey or I could have a seizure and heart attack. My doctor even told me not to stop drinking all together. Its a process, with medication and treatment of course.
Yes, it's strange. Count yourself lucky and don't use this as a sign that you didn't have a problem. Because it sounds like you did/do gave a drinking problem. Hopefully, it's behind you now. But I wouldn't be surprised if the cravings and mental obsession (that you can drink) pop up in your mind in the future. Good luck.
you don't mention your age BUT this does sound extraordinary!