I have been feeling a bit like this lately as well. It sounds to me that you ARE still experiencing anxiety, but the way that your anxiety is expressing itself now is different than it was before. There are so many ways that anxiety can present. Mine used to start with extreme nausea, proceed to racing heart, shortness of breath, sense of detachment and trembling. Lately I have begun feeling a sense of internal vibration or shaking. Not the same nausea, racing heart, etc., and I am just now starting to accept that that is yet another symptom of anxiety, even though it is unfamiliar. Of course it is frightening when these new physical symptoms present themselves because the first thought you have is of some terrible disease. It's pretty wild how anxiety can cause such real and disturbing physical symptoms. The headaches, numbness, and racing heart are all physical anxiety symptoms and if you have been given a clean bill of health, it might benefit you to try considering that you might still have anxiety. Keep your chin up. There are so many people here who can relate.