Mate don't give up, it's only schitzophrenia, your clever! I have it too.
What's probably happening is you have an ability like mine which is to speak to yourself in your own mind in any sounding voice you like, you can make your inner voice sound nothing like your own, your creative. You may also have an expiance of your voice sounding outside your head, from somewhere else. If this is so, like me your get better, its about understanding and controlling your condition, then everyting is great. In a few months time you may never hear voices again, there is hope, just belive in this. I know your doctor did not tell you this but thet did not tell you this either : http://www.sciencefo...sure-so-simple/
Chill out, stop smoking weed for a few weeks if thats what your doing(i do)
See your doctor about a drug called aripiprazole, it's new, ive been a guinne pig testing it for a few years now, it's prety good mate.
The good part is that you acept your condition, i know someone that doesnt believe they have the condition, thats why i know your clever.