I have been hearing voices and seeing people that weren't there from being a child, it got progressively worse in my teenage years though and carried on there after. They would walk into my house, these "people" uninvited and sit and watch my TV even, and i have had numerous arguments thinking they were intruders, other times i have been talking to various men and women.
I am on medication for it now and have been diagnosed as "Schizophrenic" but the medication doesn't work to well for me, it certainly doesn't stop the voices and crazy episodes i have had, like for instance, drinking cleaning products because i was convinced by the man that it was a soft drink, i have burnt my hand too putting it in the fire, so it has been quite dangerous for me.
I find stress triggers it all more, and i try and keep myself as calm as i can, as much as i can, but alas thats not always feasible in a world of madness. I spend alot of time alone too though, so i don't think that can always help but i really don't like the company of other people so well either as i am very socially phobic and shy maybe would be a better word.
Aloneness though doesn't always sadden me, it is comforting 90% of the time, and the other 10% i pine for the company of others.