Hi. My wife was sitting at the table. She all of a sudden got lightheaded, dizzy and a minor headache. This is the first time she had this happen. She is a little overweight, but always an active person. She is 58 yrs. old. She has been having a problem sleeping at night. She had a blood test about 5 months ago. The doctor said he would call her if there was anything she should be concerned about. He has not. Should we be concerned?