Hi-I developed puppps at about 32 weeks-by 34 weeks I was beside myself! I was initially prescribed cortisone cream which didnt touch it. I then went to a dermalogist (after having first been cleared for cholestasis which can produce a similar itch-the only difference with the itch being you also itch on the palms and soles of the feet which you dont with puppps).
His discription of my puppps was 'the most florid case Ive ever seen!' and he prescribed prenisolone tabs and phenergan (phenergan more so to help me get a couple of hours sleep because his feelings were that antihistamines dont normally help with this 'itch'-I'd tried claratyne and others with no relief). The prednislone tabs started working after about 4-5 days -I was on them for 2 weeks-and although it didnt go away it was enough to allow me a few solid hours sleep and eased the itch markedly.
I had Joel and Cam at 38.5 weeks and after a couple of days it had totally gone.
Like you the only real relief I got was from putting wet cloths in the freezer and drapping them over myself. I also had a moituriser that was vit. E based-very runny and low scented-that I found helped too.
Is 26 weeks early for puppps to develop? My sympathies to you because as you know it really is the pits.
Good luck-
Caz Joel and Cam at 2 1/2years old-now 3 years old