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Like others said and this helped me in the past. If you were going crazy or had any illness like you say, you would not know about it.
It takes family members and others to point it out as it is a distorted view of reality and you beleive it to be true.
If you had it, you wouldnt seek help as you know there is nothing wrong (when there really is), so you have just proven that you dont have it and almost for sure wont get it :)
I have been thru this kind of stuff too and my voices were very scary!
If you are going crazy, you would have NO IDEA as it would feel normal for you so you are not going crazy :)
Cheers
Paul