I hear loud ringing in ears and now a noise that sounds like a car motor running just outside my house. The ringing I attribute to shooting a gun when ear protection fell off. The low rumbling started at the same time headaches began about 6 weeks ago. I went to hearing doctor they put me on anti-biotics and cortisteroid thinking it may be sinus. That did nothing but cause my tongue to burn.  I am having a brain MRI on Saturday. The low noise is driving me insane. My doctor said just take deep breaths. yeah, like that will shut out the noise. It really sounds like a car. I assure you ity is not. And I hear it whether or not I am home, so I know it is not some anomally of low frequency from a nearby freeway or factory. No one else hears it. Any ideas?