I've had a bit of tinnitus for decades. A couple tips, though YMMV:
--It's worse when I'm tired, and so getting enough sleep is helpful.
--Light background noise helps distract, or cover up, the ringing sound. I like to have music at low volume, or you may find white noise to help when trying to sleep.
--I believe some people have reported that alcohol exacerbates tinnitus. Since I quit drinking (for other reasons) I haven't noticed as much ringing in my ears.
--See an audiologist!

Hope this can help, if even just a little bit. They are working on medical/technical solutions, but I'm not aware of anything truly useful just yet.