One thing that I think can be helpful when someone is dealing with a torturous voice in the head that sabotages our attempts for happiness/peace is to seek out people/resources (teachers/authors/speakers/experts in in-person, audio, books, videos, etc.) whose message or teaching you find is compassionate, healing, truthful, and/or increases your understanding on the nature of these malicious thoughts.
If you feel stuck with a torturous voice in the head as your sole point of seeing, it can get claustrophobic and anything it says especially repetitively enough times starts to feel true. To counter or challenge these vicious thoughts when we feel we don't have the ability to "see" any differently, it's helpful to listen and learn from the teachings of others whose uplifting, healing, and/or insightful/truthful message you'd struggle to fathom or tell yourself at this time. Listen repeatedly like a mantra if helpful.
Be aware though - through your journey when you seek to help heal yourself, dysfunctional thoughts might come and tell you, consciously or unconsciously, "this is a waste of time", "this won't work", "this isn't working", "this will never work", "give up now" and instantaneously, you may feel (even as strong like a gut feeling) and believe intensely that you should give up. Continue anyway to seek/get help in ways that resonate with you, that heal you, and an inner change/transformation can happen organically (like a burning of that which is false in you, that which does not serve you). Something inside you that loves this self-healing will strengthen, realizes the falseness of these negative thoughts and the lies behind their "promises", narratives, and fear tactics; and their power diminishes more and more. An inner space grows within that creates a distance from you and these negative thoughts. They no longer instantaneously grab hold of you, claim they are you and speak for you, and send you to hell.
Here are some videos I think are helpful to understand and challenge thoughts:
I really like this video (excerpt about childhood trauma, losing the connection to ourselves):
The more I learn about stuff like this, the more I realize that the world has a long history of trauma, pain, and suffering that has been passed on for generations. This pain is greater than you and I. To say the painful thoughts we experience and dysfunction that result from them are all our own fault, I believe isn't actually true and to bear the full responsibility of this inheritance of pain and suffering to our individual selves is not fair and actually, quite cruel (please do not blame yourself). These thoughts are not our own (they are inherited). No one would willingly choose them.
When you seek to heal your inner self and these habituated negative, depressive thought patterns start dropping, you not only are being self-loving but also are actually being very responsible by cleaning your inner space. Learning how to deal with your pain, you're doing your part in cleaning up this human history of suffering and most likely in your journey, you have learned (and practice) some ways how to avoid creating more pain inside and outside yourself. This is something not even some "normal" people may be doing.
