Hi friend :-)
Yes, I have on and off tinnitus. Mine started 3 yrs ago this month after I had a D&C, and this is what pretty much sparked off all my symptoms.
It started with major joint cracking, then the ringing, then all the other fun lyme stuff.
The tinnitus has come and gone, but it's mostly there. My ringing is exactly how you've explained it.
Not sure how to get rid of it, but it's not looking good, since I think the damage to the ear drums are permanent.
Many illness brings about tinnitus.
Also, if you're still on medication, this actually makes it worse. I do go weeks without tinnitus but cannot yet attribute it to any one thing.
It is VERY annoying though