I was diagnosed with Herpes Zoster (Shingles) on my forehead/scalp area on one side of the face 2 weeks ago. Took antiviral medications the minute the rash started to appear, the blisters never got bad. The pain and ithicng though has been there. Can Post Herpetic Neuralgia symptoms develope and be diagnosed within these 2 weeks or it is normal for shingles to produce pain for all this time?