Hi,
@Marie79, thought I had posted already here, but looks like it was on a similar thread recently. Below is a link to that thread. Also references a very extensive thread on dental work that includes advice about what do in these situations:
https://www.tinnitustalk.com/threads/debating-dental-crown.15301/#post-181578
In a nutshell, I have had serious dental work done since I first developed tinnitus about three years ago. That includes ripping out an old crown and having a new crown installed. No problems.
You will see more in the above thread but basically: I discussed my tinnitus with my very compassionate dentist (her office manager has severe T) in advance of the procedures. She agreed to take short breaks, as recommended by the ATA, while drilling and doing similar noisy work. I wore noise cancelling headphones doing the procedures. And I took NAC one day before and three days after the procedure. In the beginning, I took a small hit of Xanax right before, to calm me down. Today, I don't need to do that any more. All is outlined in more detail in the linked thread.
Remember that when you start consulting Dr. Google, you end up with a lot of horror stories because those are the people who post. So stop! I would say the majority of tinnitus patients have no trouble with dental work. Some already have posted here on your thread. In the meantime, if you have a decaying wisdom tooth, it's got to come out. If you put it off, you will end up with an even bigger mess. I also have had an impacted wisdom tooth pulled (prior to tinnitus) and while it wasn't my favorite thing, it really wasn't that bad.
I would avoid general anesthesia, which isn't good for you, tinnitus or not. But that is a decision for your dentist to make and will depend on your case. Usually, dentists would rather do a local.
Good luck, take a deep breath, and it will all be over. I used to panic about dental work in the beginning of my tinnitus life. Now I don't even give it a second thought.