I am 58 years male. I suffered HZ in 2014 severely and treated with valacyclovir 3 gm per day for 7 days. Ever since then there is severe itching in the back spine near thoracic area. I was on Pregabalin with Methylcobalamin 1500 Mcg for 3 months. But still I have lot of itching in the entire back along the spine. Please suggest what am I to do.