Question: How Can I know For Sure If I Have GAD?
Answer: There is no blood test or any 100% objective or conclusive thing you could ever do to "know for sure" whether you have generalized anxiety disorder. Essentially, if you think you could have GAD, consulting with a professional practitioner would be beneficial. It is important to understand that you are diagnosed based on the symptoms you report and are observed by the other person. Learn more about the symptoms and diagnosis of GAD here.
More Generalized Anxiety Q&A