I don't think you're crazy.
I think a lot of people tell themselves, I'll quit drinking <on this future date>.
"It's Friday, I'll quit on Sunday. It's the 27th of the month, I'll quit on the first day of next month. I have a birthday coming up, I'll quit after my birthday. Oh wait, St. Patrick's Day is coming up, I'll quit right after that. The holidays are here! I'll quit after that. Well, the year is almost over. I'll make quitting my New Year's resolution."
I think that once you realize that your mind is working this way, you'll realize the folly of this line of reasoning. There's always something coming up! And if you've been in the habit of drinking, a lot of those somethings involve drinking simply out of habit.
To combat this, why not try doing the reverse?
"My birthday is coming up. I'm going to stay sober for that. Oh, my anniversary with my wife is in two weeks. I'm going to stay sober for that. The holidays are coming up! I'll enjoy them more sober."
Best of luck at the doctor - I hope that he or she can help.