Hi, I am a non- smoker 36 Yr old male,5 ft 8in, 82 kgs .I have been experiencing sudden shortness of breath like I have skipped a beat for split second.Frequency was like thrice a month.Of late I also feel as if I am inhaling less air than normal, not that I am gasping. Had a scary episode last week wherein I couldnt fall asleep as I felt I couldnt breathe and felt slight nausea and giddiness/weakness.
Thanks for your question on Chat Doctor. I can understand your concern. By your history and description, possibility of stress and anxiety related symptoms is more. But better to rule out heart diseases like arrhythmia (rhythm disturbances in heart) because you are having skipped beats and sudden onset breathlessness. So consult doctor and get done ECG, 2d echo and Holder monitoring (24 hours continuous recording of ECG). If all these are normal then no need to worry about heart diseases. Sometimes uncontrolled stress and anxiety can also cause similar symptoms. So avoid stress and tension, be relaxed and calm. Consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on its solution. You may need anxiolytic Chat Doctor.  Don't worry, you will be alright but first rule out heart diseases. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.