Cold hands & cold feet are hypothyroid. The Iodine that you are taking is not enough. Not even close.
Your sister can easily cure her fibrocystic breast disease and you can cure your hypothyroid with the Dr. Brownstein Iodine Protocol: http://tinyurl.com/Iodine-Handout
The main problem we have with iodine is that we live in a sea of toxins - fluoride, bromide & chlorine that displace iodine from the cells in our body: http://tinyurl.com/iodine-and-halogen-robbers
DO NOT take iodine without the required co-supplements.