Hey Mooch, I bet it was from working in the nasty basement. I have read often that when summer comes, yeast problems get worse because of humidity and fungus. Maybe you were breathing in crappy stuff in the basement and it affected your system. When I work with mulch outside, I have to make sure to come home and use a neti-pot to clear out my nose, and I try to ALWAYS breathe through my nose if I can.
I have been trying oil-pulling for the last couple of days. I had some burning on my lips but no rash, so I figured that I might as well try it. The burning has gotten a little bit better but who knows? I will let you know if it gets significantly better.