How To Prevent Prurigo Nodularis?

I have taken 50mg. a day of dapsone to treat prurigo nodularis. My Dr. has just taken me off because my red blood cell count is low. This medicine was like a miracle cure and now I am worried I will go back to having outbreaks. What can I do to keep that from happening? I am 25 yrs. old,5'7", 190lbs.