I've had it for years, and it is permanent - but there is hope. I suggest checking out this book and following the program. It's the most informed source of help out there.
https://www.amazon.com/Rewiring-Tinnitus-Finally-Relief-Ringing/dp/1540483185
1) To get short-term relief, ask your doctor for mirtazapine/Remeron. It's an antidepressant with relatively few side-effects that will help you sleep (immediately). The first week you'll be in a bit of a haze, so if you are working, consider taking a week off. After the first week, the haze should go away. Getting good sleep will not make your tinnitus go away, but will lower its volume a bit. In addition, after 2 to 4 weeks you will feel the anti-depressant effect, so your mood will go up. Again, it will not make your tinnitus go away, but it will make it easier to live with it.
2) For long-term relief, buy the book 'Rewiring tinnitus'. There are good exercises in the book that will help you to cope with tinnitus, but it will take time and patience (that's why you should think about taking an antidepressant; you seem pretty distressed). Alternatively or additionally, try to get therapy. There are specialists that offer specialized tinnitus coping therapies. It's sometimes not easy to find the right therapist and sometimes it's not covered by your insurance, but it's worth a try.