I can totally relate to this. I was given a drug by the doctors for an unrelated condition. When the tinnitus first started, I went to the doctors to report it and asked if it could be related to the drug. I was told no, it couldn't be and so carried on taking it.
Over the next 9 months it got worse and worse until I made the decision to stop. Since then (now 7 months ago), it has been slowly improving, with all the weird central noises getting quieter, but the strong ring in my right ear is still present and I keep thinking - if only I had trusted my instincts and ignored the doctor, maybe it would have gone completely. As it has become quieter over time, I still keep hoping it will eventually go completely though. Because it was eventually recognised as some strange, inflammatory response, apparently 7 months isn't that long, which seems to hold some truth as it took months for some of the other side effects to go.
I have a strange relationship with my tinnitus though, as I can both get rid of it and sometimes it is not present when I wake up. This morning was one such occasion. I fall asleep with the TV on a one hour timer and hopefully by the time it has switched off, I'm asleep. When I awoke this morning - before the alarm, it was totally silent. I lay in bed completely motionless for 30 minutes, just to enjoy the silence. As I sat upright to get up, sure enough, there it was - blast!!