My hair loss didn't come from the cisplatin, but from the radiation. I still don't have to shave my neck area on the side where the tumors were, and maybe I never will again. *Think* of the savings on razor blades!
I also lost hair on the back of my neck running up to the radiation line. But it all came back in without the gray, which gives me a nice modern two-tone look now.
So I got that going for me, which is nice.
Seriously though, my experience was that this snuck up on me and by the time I noticed anything I was worrying about other things (like nutrition -- thanks Christine!). It'll come back; don't worry!