Heh, my body can't make up it's darn mind - I'll go for ages being freezing cold, never able to get warm enough to the point I get too cold and start vomiting (yay for having preggo nausea triggered by temp) and then a day or so later I'll be roasting hot all the time.

But I do second the suggestion of sack Dr Google and see a real GP if you are at all concerned.