I have tinnitus along with Meniere's disease (a condition of the inner ear.) I hear this sort-of whistling sound all the time. It'd annoying. But I've learned to live with it. And a lot of the time I don't really even notice it's there. I believe there are a number of potential causes of tinnitus... probably best to have it checked out by a physician although, in a lot of cases, I don't know as there is a lot that can be done for it... at least there's none in mine. Here's a link to the American Tinnitus Association website. You might find some of the information there to be of benefit:

American Tinnitus Association