Do you mean you went from 15 mg down to 7.5 in one taper? That might be too much too fast? For both of my occurrences, once I got down to the 15 to 10 range, I used smaller tapers and kept a daily pain log. If my pain level was higher than 2, I increased the dose to half of what I previously tapered to see if I still had the pain the next day.