Hello, almost 2 years ago my wife was experiencing similar, siren level tinnitus. It too, was medication induced. In speaking with her, I understand how horrible and scary it is. All I can say is, hang in there, and once the medication can get eliminated from your system, the siren level tinnitus did come down for her. She still experiences lower level tinnitus, mostly at night but it is nowhere near how bad it was 18mons-2 years ago. Now that she knows she is sensitive to medications, she is super cautious of what she takes now.
I hope this gives some hope that it may come down with time.