There are many possible causes and contributing factors to tinnitus including stress, a history of noise exposure, hearing loss, medications, and the list goes on. Because it is difficult to determine the exact cause of tinnitus, it is difficult to eliminate or treat this symptom. As the assessments that you have undergone have not yielded any definitive results, I would recommend that you start with trying some strategies to help reduce the impact of the tinnitus on your daily life. This can be done by reducing your focus on the tinnitus, by avoiding spending time in totally quiet environments. Try to play music quietly in the background, or calming sounds such as the sound of waves, nature sounds (which can be downloaded via apps on most smartphones).
You mentioned that a notch at 4kHz was found during your audiological examination. This may be as a result of the tinnitus, which may be occurring around that frequency region (the pitch of the tinnitus may be around 4kHz and therefore affected your ability to hear the 4kHz tone adequately).
In terms of your concerns regarding depression, I would strongly recommend that you consult with a psychologist to help you address the emotional reaction to the tinnitus, which is a very common occurrence. As I mentioned previously, tinnitus can be exacerbated by anxiety which often accompanies depression, and the more prominent your tinnitus becomes, the more anxious you become. Therefore, I suggest addressing this as soon as possible, along with trying the to introduce more pleasant sound into your environment throughout the day in order to help you cope a lot better with the tinnitus.
I hope I have been of some assistance
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