You don't mention how long you've had these symptoms or whether you've seen a doctor about them. Dizziness, lightheadedness, and fatigue can have many different causes, so you should see a doctor immediately so that he or she can run tests and figure out what's behind your symptoms.
Since you posted in the Chronic Fatigue Syndrome (CFS) community, I guess you're wondering whether you have CFS. The symptoms you describe are often a part of CFS, but, as I said, they can also be caused by many othermedical problems.
In addition to fatigue, CFS often causes recurring sore throat and/or swollen glands, flu-like aches, headaches, and cognitive difficulties (i.e. brain fog). In addition, CFS causes a unique exercise intolerance, where any kind of physical or mental exertion results in a severe worsening of all symptoms with hours of exertion.
For more information on CFS, see www.cfids.org.
Dizziness and lightheadedness can be symptoms of many serious conditions, so you should see a doctor immediately.
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