My grandfather is 80 years old and has been suffering from postherpetic neuralgia (PHN) in both legs for the past 6 years. We consulted neurologists, but he was mainly prescribed painkillers. Later, we started physiotherapy and nerve stimulation therapy, which helped him regain the ability to walk. However, he still can’t sleep at night due to the pain — he spends the entire night sitting up and pressing his legs for relief. We’re unsure about what treatment to pursue next or which specialist to consult. If anyone has any suggestions or can guide us, we would truly appreciate the help.