What can cause body aches, pain, dizziness, headaches, fatigue. General malaise?

Many causes. There are many causes of body aches, pain, dizziness, headaches and fatigue.You need to see your primary care physician to get a comprehensive evaluation. The sooner you get the correct diagnosis the sooner appropriate treatment can be started.
Fibromyalgia. Malaise, dizziness, fatigue, body aches, and pain are all found within the #fibromyalgia constellation of symptoms. This is not to say that one has fibromyalgia, but that fibromyalgia is one of the differential diagnoses.