I'm sorry to hear this, but I am glad to are going back on the program!
NB is designed to be a long term approach. Just as it took you years if not decades to become unwell, its takes many years to fully unravel all the layers.
Most NB practitioners will not tell you that ideally one should continue the program for 10 years are so....rightfully so, that would scare a lot of people away from it!
But ask your practitioner how long THEY have been doing it...you may be surprised! DR. Wilson has been on it for well over ten years himself :)