I'm so sorry to hear this, too. The same thing happened to me in Nov and I remember you posting that you hoped it didn't happen to you. It had been working for me. It appears we're the in the few of whatever number who can't take it. Personally, I'm tired of being "in the few", and I'm sure you are too.
Have you considered nicorette gum or the patch? I've been chomping away on the gum, and thinking about the electronic cigs, too.
Good luck with the doctor. I'm sending vibes out to you.