It sounds like peripheral neuropathy. Peripheral neuropathy is a condition in which the nerves in the torso or limbs malfunction causing numbness, pain, hot or cold feelings etc. It can be caused by a wide number of conditions including diabetes, hormone problems, infection, etc.
The cure for the neuropathy is to fix the underlying condition that's causing it. Apparently you have one of the many conditions that can cause this.
For more on peripheral neuropathy including how it is caused - http://www.healthcentral.com/ency/408/000593.html