I am a fifty one year old woman who recently has felt extremely tired and a like I have a cold in my chest. This has been going on for several months. I am pretty active usually and my job requires me to be on my feet all day, so I am used to being busy. I had a heart scare two years ago, but it was a false alarm. It was just a muscle pull, but while I was in the hospital the did exrays and found a small non calcified mass in one if my lungs. I quit smoking three years ago. I feel like I could sleep all of the time. My blood pressure runs pretty low, usually 95/65. Any ideas on what I might be lacking? I don't take any vitamins except a hair and nail supplement. Thanks, Denise