Hi there I'm also in the same boat as many of you. I have been to concert last week without ear protection ,which I was unaware of it tbh . I stayed there for almost one hour when I came out my ear was almost blocked and all I could hear was ringing, hissing. I thought I would be fine by the time I wake up. My hearing is almost back but ears are still ringing. It's going be a a week in few days since it happend. I'm so gutted whether I have damaged my ears or something which is driving me insane 24/7.
And not sure if the ringing will ever perish.
I've booked an appointment with an audioligist to get my hearing test done. See what they say