Herceptin and itching?

[nitewind]

I have been getting weekly infusions of herceptin since Dec of '06. The last couple of weeks I've had this terrible itching. It started out just on my port area, the itching was just unbelievable! The doctor says now it's dermatitis and they have to give the port area a rest. Everytime they would prep the site before infusion, I thought I was on fire! Anyway, I've had some itching on my hands, to the point of the skin peeling off. Today I had to have my treatment in the vein on my hand. Tonite, the itching is on the tops of my feet and on my back. I've put benedryl cream on both areas and have also taken an oral benedryl. Just wondering if this is a sign of something worse, maybe I'll have to stop the herceptin. Anyone else had this type of reaction? All thoughts are welcome please.
Susan