Hi,
I thought I'd join and share my experience with Tinnitus with other people who may not be coping.

I have had Tinnitus since I was in my early teens and I have never seemed to be bothered by it.
My Mother and Father also has Tinnitus.
My Mother's Tinnitus was unexpected and made her very upset, but she has overcome the issue.
My Father's Tinnitus came from being in the war, so loud noises were the factor in this case.

The sounds I hear all come from my right ear.
They range from hissing to faint high pitched ringing.
But since I have had this issue for as long as I can remember it does not bother me and doesn't interfere with daily life.

MY THEORY:-
I believe a constant high pitched frequency can cause Tinnitus to flare up and make it louder because listening to this frequency makes your ear zone in on the whatever pitch your brain is ringing at.
So of course your brain already has that ringing so when the high frequency from whatever is making it has stopped, the sound carries on making an unwary potential Tinnitus sufferer quite alarmed.

WHAT WAS MY CULPRIT?:-
In my case the source was from a PC I had built.
There was an issue with the hardware causing the faint high pitch sound.

So in short constant electrical noise.

So once I had remove that piece of hardware, the Tinnitus reduced to the typical very faint white noise like hissing I hear.

Hope this gives some insight to people out there who may find thier Tinnitus has flared up unexpectedly.