For what it's worth, coffee does affect my tinnitus, but not so much that it becomes unbearable. It also affects my H and this bothers me more, though the increase in sensitivity is also slight.
After my T became worse a couple years ago, I quit coffee cold turkey and switched to decaf. Lately, I've been slowly reintroducing coffee to my routine, and the effects have been largely positive. I do not drink it daily, only when I need a little pick me up. One major positive I hadn't really considered is that it significantly improves my mood and helps with my depression.
I can't say what will or won't work for you, but if you're like me and stopped drinking caffeine for fear that it would drive your T nuts, I encourage you to at least try it again for a few days. Living with T means constantly weighing the pros and cons and adjusting to things that seem trivial to others (coffee, changes in diet, going to that loud restaurant/movie theater, etc). I was afraid the cons of coffee would far outweigh the pros in my case. I was scared of even trying it again, to be honest, but when I did I found out it wasn't as bad as I thought it would be. I still alternate between regular and decaf though.