I've had it about 12 years. It's not as bad now as it used to be, I guess I've reprogrammed myself.
When it first started I was virtually deaf for about 6 months and it happened just at the peak of my production career. I thought that was it for me.
I've had my hearing checked and it's still above average, so no worries on the mixing front! Still mixing and producing everyday and able to sleep at night
Keep yourself hydrated and avoid caffeine, thats my best advice. You will get through it.
Needless to say, buy some earplugs.