Tinnitus...
This has happened to me a few times in my life. It sucks & is scary as all hell. If your shit ain't back at one in a few days, I'd go to a doctor. 48 hours is more than a minute if you ask me, but i've suffered that shit for 2-3 days at a time when it hit me like that. I think the general rule is if it persists more than a week, go see a doctor to make sure you haven't done any permanent ear damage.
After the 3rd time, I invested in some earplugs. Suckas laugh at shows, but at least I can hear high frequencies with no problem the next day. I use 'em when I'm Djing & when i'm mixing for clients & they want shit hella loud.
The only ones I know of are kind of expensive (at least for me), but it was money well spent even though it cut into my Flo' Dough...
Even cheapies are better than nothing. The ones I got simply attenuate the volume so it's not like they screw up what you're hearing, only turn it down a bit...
Fuck my bitch, my ears is the most important mistress in my life...
Diendolo