Unfortunately, and fortunately T is different for everyone. Upon onset four years ago it went from pure tone to ambient hiss to on its way out (barely audible) until I listened to a binaural beat track/video which produced two extremely loud tones (tea kettle and jet engine). One night it was as loud as a hair dryer in the ear and almost as loud from the back of my head. Thanks God that lasted only and evening. On the positive side, it made everything thereafter an improvement. As I sit here today it's way, way better with my quietest day occurring two weeks ago and as I type a mini vacation. I've have about 5 setbacks with both T an H and have recovered from all. Do I think my luck with persist, don't know, but every time I come on here my hope fades?
I have musician friends whom have played live with T for decades with never experiencing a single sign of increased intensity. But yet you read the unfortunate events of other's and it makes you/me freak out.
My neighbor (65/male) has had it for years from work (pipe fitter). It has remained the same, never changing. He mows, garden tills, runs the leaf blower, shoots guns with hearing protection...and doesn't give a crap.
We as individuals need to "learn" our own T and what we can and can't get away with; there's no one answer. Yes, the obvious thing to do is to avoid loud noises; I guess the consensus is anything over 65 dB but I could be wrong. However, some of us just can't help ourselves and simply, "need to mow the lawn."
Also, what's crazy T for some, is "nuttin but a chicken wing" for another. We naturally talk about volume as the main factor in intrusiveness, but I find tone and placement a huge factor. I've since developed so may tones I cannot begin to remember them, but I know for sure some louder ones don't bother me as much a quieter ones depending upon the aforementioned variables.
In short, in my experience and with many others yes, T gets better and one can recover from spikes. For other people no, T does not get better and they do not recover from spikes. Learn your T and make the best decisions you can.
I do believe flat range speakers are WAY more damaging than other loud noises. I've never experienced a T spike from motors and whatnot, but as soon as I'm around PA speakers (flat range) I get a spike. Motors and whatnot offer me H setbacks, but as mentioned, as far as T those speakers are evil...as evidenced by all the onset testimonials.
I do want to offer that my T is is/was noise induced but as soon as I began physical therapy for my spine I saw a reduction in volume, pain, pulsatile and chirping T. I have pretty pronounced to terrible back/neck issues, thus may not work for the limber folk out there.
Take care, and may the cure some soon. I don't know you all but, I do care for you.
Be good to one another.