Hello and welcome to HCM. I carefully read your query. Thank you. Giddiness or a sudden feeling of falling, without it ever happening, is more a symptom or certain types of anxiety, agoraphobia and generalized anxiety disorder/panic attacks. I am assuming that you do not sleep well.. I would recommend you to follow a strict regimen, where you sleep well and be physically active for at least 60 minutes, since it does well to you, but not only running, also walking, biking, swimming etc. If you feel like panicking from your state, then consult a psychiatrist to further address your problem, and decide whether to start treatment or not. Remember, anxiety is not a mental illnes. It is merely a disorder that affects your quality of life. I would also recommend some cardiac area tests, just to exclude the organic origin of this phenomenon: - EKG - 24-hour blood pressure monitor - 24-hour Holter rhythm monitor After, the results are back, feel free to contact me or consult your cardiologist. I hope I was of help. Take care. Kind regards, Dr. Meriton