I'm very sorry that you're struggling with T so much. I have severe T and find that sometimes it seems unbearable and I just want it to go away. I used to tell my husband, "I just want a 10 minute reprieve from the noise!" It can be such a difficult malady, however ...
I am a Licensed Professional Counselor who teaches clients on a daily basis Cognitive Behavioral Therapy techniques to assist with managing an array of issues AND have found CBT to be essential for me in managing my T. It sounds like you've tried CBT, but I want to encourage you to be very intentional and diligent in applying the principles, frequently.
I'll be very transparent and share a personal example of how this looks for me:
I'm relaxing in my living room with my husband after a long day of work when wham! my T suddenly becomes very loud! My first instinct is to "give in" to the sense of panic this intensity of T creates in me and become distraught and begin self-talk messages such as, "I can't take this - I can't live like this!", "This is too much for me! The noise is so loud - I just want it to stop!", "How am I going to do this?" AND the biggest fear inducer "What if it keeps getting louder and never stops? What then?"
Yikes!! None of that is helpful at all. What is helpful, however, is self-talk like this (and I really do talk to myself out loud because it really forces me to hear the words, not just think them) ... "Mina, you've been through this before and things have been fine. I know it's uncomfortable and can be scary, but you'll be okay. It will quiet down soon and things will be okay" AND then I
intentionally distract myself by engaging in a conversation with my husband, playing with my dogs, or going out on my deck ... Anything to take my mind away from it.
My Tinnitus has only been severe for a few months, so managing it at this level is still fairly new for me, but for each day that passes, I have greater control over it.
I've only been on this site for one week and, already, it has been helpful and encouraging to me, particularly as I read about habituating. Wow! That creates in me a sense of gratitude and HOPE!!
I'll be praying for you to find relief and rediscover joy, Aschenherz, because life can be very beautiful, even with tinnitus. May you find hope again! Be blessed!