Hi I'm 50 and live in the UK, I first started hearing this noise during covid lockdown in 2020 when the cars and world stopped. I had the electricity board, gas, water, everybody out to the house to test to see where it was coming from. I could hear it indoors and sat in my car stationary on the driveway. It gave me insomnia , caused anxiety and headaches luckily I was off of work (furlowed) so I didn't have to worry about working and thinking the next day. I'd learned to live with it, and it faded in to the background. I could only hear it when I tried and then I could cut it out again.
It's been 5 years now and stupidly Friday night just gone I saw an article and did a test on it and now it's back!! It's kept me awake for two nights I feel anxious I have palpitations palpitations, headache and cannot sleep I have tried everything even a sleeping tablet last night (it didn't work) I could cry! The only thing that seems to help is wearing earbuds which is really uncomfortable with sound playing. I'm not sure how I stopped it last time I must have just become used to it. I really hope that happens again shortly, I cannot cope and as you say the doctors will look at me as if I am mad and what can they do? I also suffer tinnitus on and off in my left ear, I used to be cabin crew I think that's what caused tinnitus from the beginning. I have only come across one other person that can hear it he is also cabin crew. I can't let this sound take over my mind again I think it will break me.