I went to see Judas Priest a couple of years ago and got a bit of a fright because during the gig my ears seemed to get worn out, so all I could hear was a big rumble of bass with the guitar solos making a funny little high-pitched
wee-wee-wee noise over the top. And my ears were ringing alarmingly the next day - I'm used to that "morning after" feeling, but this went on for more than 24 hours.
So like Blue, I've started wearing earplugs at the very occasional gigs I go to nowadays (I don't do nightclubs!

).
I can't remember the name of the plugs, but they have little "pins" in them that you can change for different levels of attenuation. They work really well - I can now hear
songs instead of noise, there's no ear fatigue and no ringing, not even immediately after the gig.
I was thinking of getting some of those custom-made ones which fit right inside your ear. Quite expensive, but as a music fan (I won't call myself a musician :roll:

) I think it's worth the investment to preserve my hearing.
(
EDIT: I meant to say, Dave, I'm sure your cold is contributing - my brother gets a similar thing occasionally. Hope it clears up soon!)