Have you tried registering on a tinnitus support forum? I did when mine was at its peak and they correctly assured me that it would settle eventually. The trick is "mind over matter" meaning - if you don't mind, it won't matter! This is very true because the more you let it get to you, the worse the noise gets.
You need to make almost superhuman efforts to convince yourself that it's really not bothering you at all and as you succeed, the noise will wane. I know, I have done this and there were times when I felt I would go stark raving mad if someone didn't get that whistling out of my head! Sometimes it even seemed to drown out things like the TV, telephone and other extraneous noises. But I managed to beat it. And now, when it gets up steam again, I find I can just tolerate it and very soon it goes away. But once I start fretting about it and thinking how desperate I feel, it just gets worse and worse.