These symptoms are due to the slowing down of the body's metabolism. The heart rate is slower resulting in drop in blood pressure. This result in slower circulation which in turn causes the cold feet and hands. Body wounds tend to heal slower than before. Frequent headaches occur, energy and endurance is low and digestion slows down.
Hair then becomes lifeless and falls out more easily.
Thinking is sluggish and memory is poor. Many of these symptoms are common to the ones reported by the medical profession yet some are different. Generally treatment for hypothyroidism is hormone replacement such as Synthroid or Levothyroid. This supplements the T4 which the thyroid gland no longer produces the amount the body needs for metabolism and other bodily functions. However the thyroid no longer produces the amount of T3 the body needs as well.