Sorry you had a bad brain day CC.
I can relate. I too keep my house quiet but it's over at 3:45 every day when my son gets home from school and on weekends it's chaos. I don't think the noise helps me at all. I still get way overloaded in the noisy world out there. So personally I don't think by having a quiet house that you're doing yourself any harm, but that's only my opinion.
I had the loud noise incident yesterday while out... I was in earplugs but have to remove them to eat. (Celery with earplugs equals soooo loud in head) so when I removed them the restaurant noise hit me and my brain did the buzzed overload fried thing. I never got it back yesterday.
I'm still suffering today. Pain is bad. I think I'm still maxed from neuropsych day. (3 days later) just so fried.
Hope your today is better...