I've had pesky tinnitus for yonks. it's a nuisance to say the least.
I also get a low level hum due to ??? GKW God knows what , but the causes are manifold.
In the course of years of discussion on this topic it came up that sensitivity in the ear dept can be due to calcification of cilia. Fluoride in the water is a top candidate.
One way to manage this is to supplement magnesium, which I do anyway. It may take months to impact on the hiss/ringing though.
This seems to stablise the ear probs, though I don't take huge amounts.
Mg is low in most diets unless you eat tons of veg,nuts etc so consider this as a possible way forward.
Mg Citrate is easily absorbed- but also a laxative and long term can make your body lazy- so like all these things read up and get sensible advice and apply carefully to your situation.