I'm so sorry to hear that, although its not really surprising. Ideally, one stays on a NB program for about 10 years or so. Of course, that does not mean it will take that long to return to health, but just as it took your body many years to become unwell, it take years to completely unravel all the layers. That is what NB is designed to do.
I wouldn't be surprised if most have not heard that from their NB practitioners, as it would certainly push a lot of people away. Dr. Wilson has been doing the program for many many years himself :)
I am sure you will bounce back rather quickly!
Best to you,