I had the exact same problem when had PUVA and it got really distressing, I won't go into details but i got to the point of desperation as i had NO sleep for 3 weeks and as a nurse it was not safe. The nurses at the hospital didn't believe me and no antihistamines helped, i was taking piriton hourly!!!! (be grateful you weren't a patient on my ward)

It was only when i went to see consultant and told him all the details about how it was affecting me that he stopped it completely and he prescribed, aqueous cream with 1% menthyl in it. Took about 3/4 weeks till itching stopped completely but it eased every day!
I begged them to stop the treatment but they kept telling me to persevere and in the end i just refused point blank to go which is how i got appt with consultant brought forward. I would recommend asking for that cream it was my lifeline!!!!
