How Can Tinnitus Go Away if Damage Is Irreversible? How Can Stress Cause Tinnitus?

I don't understand something? If Tinnitus is in fact caused by damage to hair cells in the ear that is irreversible, then:

1). How can Tinnitus just go away if the damage is just irreversible?

2). How can stress cause damage to hair cells and initiate Tinnitus?

I think stress directly doesn't damage the hair cells. It just makes an already present tinnitus due to hair cell damage worse or stress related T is altogether different which doesn't have any hair cell damage and is some brain phenomenon

 

Tinnitus signal comes from the brain. It is a lot more
Complex than hair in the ear it could be cochlea or circulation etc...
Some people have no hearing loss and have tinnitus , some people are
Deaf but have no tinnitus.

 

My T was definitely caused by stress. I had no noise exposure, infection etc.
I am very sure my audiogram would have been the same before and after T onset.
It is the ski slope graph where higher frequencies are worse.
During a stress phase, my head started ringing like crazy.
You can be right that maybe I had T already before. But I was never aware of T, fleeting T or anything with my ears.
Nevertheless I hear a sound in my head now.
Very difficult, or impossible, to put it into the background again.
I am working on my reaction to it - that I simply do not react.
But currently going through a depression because of T.

 

@Martin69 do you have Hyperacusis as well?