Thanks for posting your query.
First of all its very essential that are your diagnosis of herpes zoster
was right or wrong?
I mean to say if you are suffering from another disease (not from herpes zoster), then prescribed medicines won't work and your condition won't improve.
Although appearance of herpes zoster is very specific and no body can miss.
You should consult with dermatologist
and go for repeat course of anti-viral therapy
A variety of anti-viral medications are available and effective.
You can take Famciclovir
500 BD for 7 days on written prescription.
You should also take topical ointment of aciclovir
and apply calamine lotion for soothing effects.
Herpes zoster is a self remitting viral illness and it will recover within 5-7 days.
Dr. Mayank Bhargava