I am 45 my tsh level is a 16 the doctor said i had hypothyroidism what does this mean and what are the effects?

Doctor's right: Your doctor is right that you have hypothyroidism, underactive thyroid gland. This condition leads to fatigue, low energy, cold intolerance, constipation, and increased cholesterol levels. But how an individual might feel varies widely. Sometimes one feels just fine for a while. It would be advisable to see your doctor to prescribe thyroid hormone supplement at a sufficient dose to get TSH ~1.