Actually, I have fighted with them using my imagination. At first, they were about 7 voices. They looked like demons to me, and they kept attacking me all the time. I have tried to use my imagination to let them fight with each other or even let them destroy themselves. This is a long story to tell how do I fight with them. I can fight with them because the key is wherever I look at, they be there right at my focus. For example, I can destroy them (the demon's shape) by throwing them into the wheel of a running car. This is just one of my example how to fight with them. But it's not easy to kill them. I have so many different technics to fight with them...
I wish I can write more and more to tell people how to fight with them, but I have no time yet. After 2 years of fighting, I could not see they appeared with a complete form anymore.
After 2 years, now there is only 2 voices left over... I now hard to fight with them because I don't see them anymore. I am begin ignoring them and taking medication, I have a good job. I am now can concentrate, and I can work every well too. I don't hear them that often, and they can't attack me anymore.
So, my point is that if you don't know how to fight them, then the best solution is to ignore them.
In my own opinion, there is something invisible that exists around me. I am a very sensitive person and because when I got so much depression, somehow they (demons) pocess into my body. They (the demons) are invisible and belong to a super sensitive world. Somehow, my body's sensitive frequency reaches their sensitive frequency, then I can hear and see them but no one else can.
After years of experience, I think I now understand why I can hear and see them, but noone else can hear or see what I feel.