Why do doctors ask to do mri and ct scan and all i get is all normal. but it say nonspecific hypoattenuation within white matter t2 flair hyperintensi?

Artifact. : What it does show is a nonspecific finding that the radiologist cannot define exactly what the character is. Also it does not show any signs specific for a disease process, tumor ,cancer or other lesion. At best your primary care doctor maybe reorder another study in three months to one year later to see if there is any change if the reason you had in the first place persists.