Is it possible to have anxiety disorder and not know it? have physical symptoms (tachycardia, sleep issues) but am mentally clear, happy, love life.

See below: Have you talked to your primary care doctor? Before diagnosing any mental illness, e.g. Anxiety, depression, physical causes need to be ruled out. I would recommend talking to your primary care doctor first to do a full work up and then, move based on findings. Meanwhile, practice relaxation, stress management, sleep hygiene. Good luck!

Not anxiety: Part of making the diagnosis of anxiety is that you know that you have it. There are other imbalances that cause the syndrome of related symptoms without having anxiety. There are multimple causes of these syndromes. Sometimes the same anxiety medication will work on non-anxiety syndromes. But first find out why. Check medical issues, diet, habits, stress and other other mental health factors.