zapping your head?

Hi Everyone!

I have been using the terminator zapper by Don Croft for a while now.
A friend of mine just purchased one for these really bad migraines he gets and was wondering if he could use it on his head when he gets the migraines? I told him I wasn't sure because I never used it on my head before.

Do those of you who have or have a lot of experience with the terminator know if it is ok to put the zapper somewhere on your head?
Thanks so much for any info!!!

Michelle