you should checkout the posting on a similar thread:
http://www.medhelp.org/posts/Undiagnosed-Symptoms/Why-do-I-get-unexplained-chills-with-no-fever-or-infection/show/517843
A post that I made there:
Most threads that I read you have had all your medical tests and those with ailments are being treated. Yet the chills still persist. These are some considerations that you can try:
1. Drink lots of water on a regular basis (preferably filtered or bottled water).
2. Consider your electrolytes and trace minerals that are being diluted.
3. Take Coenzyme Q10 (CoQ10) supplements. Research CoQ10
4. Acidophilus supplements – take periodically for a few weeks or months.
5. By far the most important – striking a balance in your body of Sodium, potassium and calcium.
You might be eating the right foods or taking the correct supplements, but your body is not absorbing these in the correct balance that your body needs. You would need to experiment which one is making you out of ‘balance’. Try taking an extra potassium tablet. Give it some time for your body to absorb it. Drink lots and lots of water (preferably filtered or bottled water, with or without added electrolytes). If not, then try calcium, and then sodium. Again you might be taking these, but your body is not absorbing these, and also not in the quantities your body needs to be in balance. In addition, if you are sweating profusely or get foot cramps, this will also help these.
Keep us updated on your condition.