You may be interested in reading an eXtension article that addresses your concerns: http://www.extension.org/pages/Memory_Loss.
That article suggests that you should see your health care provider. For a list of questions to ask your doctor during the visit, see the Mayo Clinic's recommendations.
"If the problem might be serious, a thorough evaluation might be recommended. A complete medical examination for memory loss may include gathering information about one's medical history, including the use of prescription and over-the-counter medicines; diet; past medical problems; and general health. Because a correct diagnosis depends on recalling these details accurately, the health care provider may also ask a family member for information.
"Lab tests may help your health care provider find any problems. There are also tests of mental abilities: memory, problem solving, counting and language. A brain scan can help the doctor find certain disorders and may also show signs of normal age-related changes in the brain. It may be necessary to have another scan later to see if there have been further changes in the brain."
While you are at the doctor's office, make a follow-up appointment for 6 months or so later. That way, your physician can have a baseline to assess any changes.
You may also find these resources helpful:
Impact of Lifestyle on Memory
Forgetfulness: Knowing When to Ask for Help
Understanding Memory Loss: What To Do When You Have Trouble Remembering
