I agree with @Afraser strangely what you describe is exactly the side effects of Taxol @Blossom1961 wondering if it's just taken a little longer to come out? how long since you finished Taxol and went onto Herceptin? I've know alot go onto that but haven't heard of side effects.
I know with the rash from Taxol absolutely nothing worked, antihistimines, creams zero...only ceasing and letting the body heal. I've been left with neuropathy that impacts walking longer than 30mins, my toes are numb and in excruciating pain. Ah well!