I'm sorry I don't have any links - most of what I found was suggestions on this forum. I think my GP was able to find research but I don't know what exactly. I hope you had some luck with the ENT.
Also, haven't been to see an ENT for over 15 years, as all they did was give me a hearing test and tell me they could do nothing. But I would consider seeing one again now, with a little more information at my disposal.
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...
I have actually just obtained a week prescription for prednisolone from my GP (UK) having been to an extremely loud gig last weekend. I wore ear plugs as always but should have left altogether. Tinnitus spiked massively along with hyperacusis, so after explaining my distress and sleeplessness...