If you actually do have tinnitus it is a chronic condition, usually the result of acoustic trauma - time around artillery or on a flight line without hearing protection. It is permanent damage and does not go away. It may get worse but it won't get better. However, if you have a whistling or ringing every now and then, you don't have what is generally referred to as tinnitus. Most people experience this from time to time - can result from any number of causes - head cold, too much caffiene etc. Good news is - whether you have the chronic condition or not, you don't have to do anything about it. Of interest, I noticed recently that Peter Townsend of the Who runs an add for a tinnitus/hearing protection organization (sounded like a nonprofit) - saw this in the back of sound on sound I beleive it was - a mag for audio engineers etc. He attributes it to the slightly high volumes experienced during his musical career - but hey it beats having what Keith Moon had.