Travis,
Peptron seems to have got it right. Depersonalisation can make you hear or feel all sorts of impossible things.
I have seen things that weren't there, heard sounds that existed only in my head, even felt something brush against my skin when nothing was to be seen (scary as hell). So, if it comforts you, you are not alone. Your symptoms are different from mine, but the core idea is the same.
I too feel constantly that I am about to go crazy in a minute or two. It's another common trait to the disorder. And I've seen my body move out of its own accord, which is not unlike your voice altering itself.
Of course you know you should see another psychiatrist or psychologist, so I won't stress it. But let me make a comment: anyone that sounds horrified when you talk to him/her is not fit for the job. My former psychologist seemed to be disgusted by what I was, and spent all her time questioning me and trying to make me admit I was faking it all. When I refused to, she turned sullen and criticised me all the time, and it was a relief for us both when I went for another therapist.