Check this out: Web Journey Alexa
On yesterday I am ranked 57,000! This is really weird considering my last seven days used to be 450,000. Does anyone know where this traffic increase came from? Is it a fluke? I'm personally baffled.
What kind of traffic analytic you use. I suggest use google or histats you can find out the source of the traffic
If you are using a site with cPanel (which your host provides) you will have Awstats by default.
I find it vague you do not have a stat tracker installed, please do that ASAP.