Hi there - we're the third factor - non smoking, non drinking, and unexplainable! and I'm 46 too... But I agree with Karen on all counts - it does sound benign... Particularly the fluctuating node sizes. I'm sure someone will correct me if I'm wrong - but usually nodes (cancerous ones) just tend to get bigger. with an infection they fluctuate - try not to worry - and enjoy your vacation!!! I know it's not fun with this on your mind but really it isn't cancer until they say it is! Hugs hon!