I went to see Clean Cut Kid (indie rock) at the O2 Institute in Birmingham. In a small room upstairs but I think the volume levels were set for a space 20x the size. My partner has no hearing issues but could barely tolerate it either.
My GP had also not heard of using steroids for tinnitus/hearing loss, but after explaining in a relatively articulate way that I had seen evidence for it online, he did his own research, got me on the scales, and gave me a week of prednisolone at 30mg per day. I assume that he had access to some scholarly articles on his PC, and it was enough to make him agree to it. I think it really depends on the receptiveness of the practitioner, and your way of communicating. I was obviously somewhat distressed, and explained the effect it has been having on my mental health, but was still lucid enough to make a convincing case for it.
As for progress, my T calmed down somewhat after taking my dose this morning, and I'm working on distracting myself. Unavoidable noise exposure is especially frustrating (although mine was avoidable), especially when others are so oblivious to the effects it can have. However, I try to put things into perspective - I could be living/working in a warzone and have complete permanent hearing loss from a single explosion, for example. I can still listen to music, people's voices, birds etc., albeit tentatively at the moment.
One thing you could try is wearing small or half foam ear plugs (skin tone) all of the time, at least while your ears/brain settle, which I expect they will.