Hi, Rameek,
I'm so sorry you're having this problem! It isn't fun to hear a whistling sound in your ears all of a sudden, and, yes, it is very upsetting, too. Doctors don't really understand what causes the ringing a lot of the time, either. It's possible that your whistling/ringing sound will calm down in time, since you've only had it for a few weeks.
I've had tinnitus for a long time myself. Mine was originally caused by loud noise. At first, the tinnitus was bad, and hard to get used to. But after awhile, I found that if I didn't pay too much attention to it, it faded into the background. You might try looking at some of the other posts on this website. There are some very good suggestions for things that can help you cope with the problem, such as music you can download to listen to when you go to sleep.
Are you having more trouble during the day, or at night? If you can keep some background sounds around you all the time, it really helps.
Please don't think that your life is over because of tinnitus!! There is a lot of research being done on possible cures for tinnitus, and it won't be too long until they find a drug or a treatment that will work. Keep checking Tinnitus Talk for updates and information.
Also, it's possible you could have a condition called hyperacusis, in which you are highly sensitive to sound. Did you say that the whistling sound gets worse only after hearing noise at a certain pitch?
All of the members here at Tinnitus Talk have some form of tinnitus, and we're here to share our feelings and thoughts. We care, and don't want you to give up! Please keep us posted on how you're doing!