Hello and thanks for posting your query on HCM
Yes the medications you mentioned are used for post herpetic neuralgia
They act by reudcing the severe pain
associated with the condition.
Continue your treatment for the required time period and see the results.
If the symptoms are not relieved after copletion of the course then consult your doctor.
I think this is the best way.
Trust your doctor. He knows your condition the best as he has examined you and prescribed the medicine.
Thanks and take care