Ok....All you need to do is get a young person (they have great hearing). People's hearing starts out super excellent at birth and slowing deteriorates as you age. Get on your PC and Google sounds or frequencies, find the sound or frequency that you're hearing, let the youngster hear that sound and ask the youngster if he/she hears that sound in your house when you're hearing it.
Here's an example of a frequency, the internet has every frequency that exits. This way you can determine whether or not you're going crazy.
I have tinnitus...I found the frequency that I hear on the internet. When I play it on my PC everyone in the house yells at me that the sound is excusciating!!! Even the people in the back room of the house 50 ft from my PC scream at me. I tell them....this is what I hear all day so it's not like I'm making them hear something that I don't hear 24/7, day and night!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!