You've just got to sing, do some kind of singing every day. Early mornings and cold weather can mess with that. I drink special teas with cayenne pepper, but I think you're psyching yourself out, really.
Sentiment: NEGATIVE
I've been singing properly every day since I was about fifteen or sixteen, and I have never had any problems with my voice, ever. I've had a sore throat here and there, had a cold and sung through it, but that day it just went while I was onstage in Paris during a radio show. It was literally like someone had pulled a curtain over it.