Oh you poor thing I know exactly what you are going through, I had it really bad in the last few weeks of my pregnancy, I stratched my skin to the point of bleeding it was that bad.
I ended up using Aveno Shower Oil for dry itchy skin and my DH brought me Palmers body oil its in a spray bottle and the oil is yellow. That seemed to work the best. Use the oil morning and night and it does help enough so you dont go crazy.
It didnt stop till after Arianne was born and there isnt much itchy cream the doctor can perscribe