Hi Alan
The posts above by the other guys are spot-on. With them I sympathise with you. T is a bully that is best positively ignored. You can train your brain to ignore this and by so doing will not allow it to impact on your life. Keep active to keep your mind off it and avoid quiet times, silence. I am a great believer in white/pink noise which I have on mp3s and play through earplugs at night and I sleep like a log. It works for me, maybe not for everyone.
You asked about Tinnitus Retraining Therapy - it is a program developed by Pawel Jastreboff and Jonathon Hazell - Google 'Tinnitus Retraining Therapy T Jastreboff' and you should come up with something. There is a website describing it in some detail. These guys also wrote a book describing the treatment, it is aimed at TRT practitioners but it helped me to understand the model Jastreboff developed and how TRT works.
Good luck with it all - you can make it work, not to cure it but to live with it by pushing it into the background. Beware of the Snake Oil promoters - they are out there by the cartload and they prey on the desperate. If in doubt ask on this forum like you did with Coleman - there are plenty of people here who have already sussed out a/holes like him.
Stay positive - it's early days and you have that in your favour - don't allow T to become hard entrenched like mine, because I didn't do anything about it for fifteen years - but work on this now and you will not let T dictate your life. (But it still wasn't too late for me, which I am eternally grateful for). I am winning this fight, even now!
This forum has heaps of people who have been / are going through all this. We're all in this together.
Go for it Alan - the very best to you.
Ray