To elaborate on my post, I experienced a burning/cooling sensation that seemed to emanate from the inner ear when my setback was at its worst a few weeks ago. It felt like someone had poured warm liquid into my ears. I wouldn't even describe it as acutely 'painful' and it only seemed to come about as a delayed reaction to noise exposure but it was definitely very uncomfortable and distracting. I also experienced mild pins and needles and tingling in my cheekbones and forehead which seems like it may be referred pain.
My setback seems to be improving but it's still a slow process and my ears still don't feel 'right'. I'm not getting the burning/cooling and intense fullness thank god but I'm still left with sensitivity after noise exposure - my ears tend to feel a bit 'warm' and inflamed but this no longer escalates to the burning/fullness of a few weeks ago. I also think I might be suffering from TTTS - my ears constantly feel 'tight' around noise almost like a coil that is about to spring. I wonder if the middle ear muscles are over-reacting and tensing in this case. Incidentally, I took magnesium one night a few days ago and it could just be coincidental but it seemed to help. I've read some interesting descriptions of hyperacusis on this forum such as people saying it feels like a filter has been removed and your ear is 'open'. Mine definitely feels like that at the moment.
For now, I'm just trying to play it safe and using earplugs when I go out - I don't plan on doing this long-term but I think it's important to listen to your body when in the midst of a setback. Above all, I'm trying not to rush things.