To echo the rest, a doctor is the best course of action.
However, I had similar symptons which ultimately nearly resulted in my death.
Not to drama here a litte, you say cold but sweaty, any muscle pain? Any shortness of breath or unusual fatigue (this result in me being diagnosed with a pulmonairy embolism that was hours away form killing me) ?
Is there any chance you have been out in fields or forest/heavy garden work (speculating that it could be a tic or the early symptons of lyme disease)
Any issues with wieght gain/weight loss (thyroide function perhaps)
Family history may point something in the right direction.
To add a little comedic value - your symptoms also may be related to the plague...
Go see a doctor... or a shaman, or if ou cna find her Dr Quinn.
H