Mosquito buzzing, advice on managing the frustration?

Hello, I (21F) have been having issues regarding hearing a mosquito when there is none.

I have had issues occasionally over the past couple of years in times of stress, regarding hearing barely noticable music, when there was none. This would usually happen when I was alone in the house, or at night when everyone was sleeping. I didn't really believe it was just in my head until after it happened enough times that it couldn't just be coincidence.

Now, for the past few days/past week, I've been hearing a mosquito buzzing. It only happens when I'm not listening to anything, and it even sounds like it's flying around. It got bad enough last night that when I woke up, I heard it and jumped up to turn my phone flashlight on to see if I could get it. Once again, after minutes of looking, no luck on finding anything. It is starting to drive me nuts and I've already been going through a hard time in my life. It has become even harder to sleep, or even to fall asleep/back to sleep, in the first place.

It can be overwhelming always listening to something or watching a video to try and avoid the sound, so I was wondering if there were any tricks to helping this?

I'm happy to answer any questions in the comments.