Tinnitis is a symptom of RSD. For the first four years I had a loud "squeeking" sound especially in my left ear. It finally went away but now I get a very loud tone at as high as about 20k hertz that wants to drive me buggy sometimes. It's actually so loud that it hurts.

Cod liver oil seems to help it a little (taken internally) now, but I didn't try it until just a couple years back.