The itching is always worse where your clothes rub It drove me crazy - I used Gold Bond Triple Threat it helped me greatly...just take it from me don't stop using it or the rash will come back (I made that mistake myself!).
I'm on Gabapentin also (for depression... Gab's a generic Neurontin) in combo with Paxil. I never noticed itching increase when she added Gab, but was kind of 'out of it' and bipolar like at the time. I asked about the itching and the doc said it was from the treatment (Pegasys/Ribavirin) drying out my skin so much. Got some relief by using lotion (Aveno baby - no added colors or perfumes). I had the itching (especially crotch area) all through treatment, regardless of viral load... Hope this helps...
First night I have slept in a lomg time and the itching has subcided, I think my hi viral load has a lot to do with this.