After recovering from a bout of the common cold, I've noticed the skin around and of my lips is significantly dryer than it was before from breathing through my mouth while my nose was all stuffed up. This has made upper register playing extremely uncomfortable and my range has dropped from a fairly consistant double G (G above double C) to the G below it - I can still squeeze out a double C, but the tone and power is simply not there as it was before. I assume these problems will go away fairly soon as my skin regains its usual moisture, but until then my playing is going to be below my standards. Has anyone ever experienced a similar issue? If so, how did you deal with it?