I like to use three strategies with the critical inner voice.
1. When the voice happens I say to myself, "Ahh, there is that critical voice again."
You can say similar responses like,
"Ahh, that is the voice of shame." something like that. I personally like the "ahh" part. This means I am an interested observer of this voice in my brain. I am not pushing it away, fighting it, judging it. I am simply acknowledging its presence. This creates an intellectual distancing.
2. I find that I can control my reaction to the voice. When you have a symptom happening inside of you, in this case a critical inner voice, there is a reaction to the symptom. You can call this reaction an automatic reaction. Automatic reactions almost always include judgements and they feel reactive.
For example here are some automatic reactions that I have had to my inner voice.
Why am I having this voice? I feel so defeated.
This voice is right. I suck at everything.
I hate my life. I just want to die.
These are all reactions to the voice. Notice how they are judging the voice? What I like to do is choose my reaction. Instead of the automatic reactions or autopilot, knee jerk reactions, I can choose mindfulness response actions. These actions include labeling the voice, "Ahh, that is the voice of critism." rating the voice. "This voice is really loud today. Like a 10 in loudness." And any other mindfulness that is grounding. Like using your senses to externally ground yourself.
3. The third strategy I use is self validation. I could not just do this until I watched the DBT video on the 6 levels of validation by DBT Peer Connections.
I use the "validate by current situation" level. I will say to myself, "It is understandable that you feel bad because that critical voice is trying so hard to be heard." Or the validate by history. "It is understandable that you would hear this voice with many insults and judgements because these are the voices you heard as a child."
These validating statements are simple and effective and they do not require much self love which I do not have at the moment.