I think you're right, you're going nuts. I can't blame you, I had a period like this too. But some noises are really not worth worrying.
Yeah I think you're right. I don't know why I went so nuts about that air rifle shot in the first place. Maybe it was just this "guns are very loud and bad for your ears"-anxiety. I actually measured the dB Level again with a friend with the exact same settings and we reached 108dB max (super close to the rifle). At arms length it was no louder than 105dB so technically there can be no damage to the ear. The mind can be a bitch though and I think i'm also reacting to the prednisone a bit, too.
Thanks to all you guys for the support