Tired and cold all the time and little energy

Is there anything that can cause a person to be tired and cold all the time with very little energy? I am a woman in my late 30's and I have 4 children. I have experenice being tired for the last past 8 years and the coldness is something that is recent ( pass year ). I would say that my energy level had started to drop around the I had my twins in 2005. My doctors said that there is nothing wrong with my levels of iron and thyroids. But my conditions is getting worse with every day. I find my self in my bed more everyday instead of spending it with my children. My children ages are 12, 4, 4, 3, married and in school. I started to noticed this when my son was 5 years olds. Do you have any advise on what I should do??

Thanks