I have pretty serious anxiety as well. But how is a label like GAD a diagnosis? A diagnosis involves determining the cause of a disease or disorder, using the concept of differential diagnosis to rule out other causes. If a therapist applies the label of GAD or MDD, then purports to "treat" these disorders based only on that label, then what precisely are they treating?

Like you I have physical symptoms (fatigue, cognitive problems, and more) as well. The point for me is that there is no separation between mental and physical, and the only legit healthcare is that which addresses it all holistically.