Dee -- We have all been there, done that, got the T Shirt. In 2004 I was here feeling exactly as you do now. No cancer then, but surfaced a few years later. Maybe a misdiagnosis, maybe not. Really doesn't matter.
As others will tell you, it's not cancer until the pathologist says it is. Even then, treatment options and efficacy are vastly improved. Sooner you find out, the sooner you can attack it.
Use this site, as the support is great, but do not freak out because of statistics and horror stories that you read. Lots and lots of folks with successful treatment and long term survival do not post on sites like this.
Best of luck and we are all here for you.