I've taken Hydroxyzine, it's an antihistamine with anticholinergic effects, i.e. it slows down the nervous system and can be effective for anxiety and especially sleep. Of course, it isn't as powerful or even comparable to a benzodiazepine, but it helped me get my act together when I first got tinnitus. Since it's an antihistamine it doesn't build tolerance. It isn't ototoxic in the sense that it doesn't kill hair cells, but I think any drug that impacts the nervous system can mess with tinnitus or hyperacusis in some. Any drug should be taken with great vigilance and caution, but I think Hydroxyzine should be pretty safe.