Hi there, I'm really sorry that it causes so much anxiety for you. I really feel for you and I guess everyone that has hearing loss/tinnitus will go through that stage. In my case the tinnitus started six years ago when I was suffering from a severe burnout. At that time I was doing music production courses for media composition. It freaked me out, just like you. I did a hearing test and all was then (still) fine. I went to a physical therapist to see if it had a mechanical cause. It didn't. My GP doctor told me I had to learn to live with it. Well that took a while.
There's already a lot of advise offered in the comments. But accepting that it's there and that it's phantom noise really helped me. Increased stress levels means increased tinnitus for me too. So I really had to take care of myself, which doesn't come naturally for me. Since I started meditating I seem to become a little better in accepting things I cannot change. It did however stop me from pursuing my musical dreams and I wish I hadn't done that. You can never know what the future hold. So it's better to pursue your dreams now, than rather wait until things get worse... if they do at all. So pursue your dreams and continue (speaking to myself too here).
Take care,
Erik