I had a stent placed a few days ago . . I get a fluttering sensation then tend to lose my breath but breathing return to normal after taking some long deep breathes. The cardiologist said that within time this would go away! My heart rate when walking is about 110 but drops back down to 85-90. I feel really good but this shortness of breathe makes me nervous at times. I do have sleep Apnea so night time is the worse for me. I ve had sleep studies done n the Apnea isn t bad enough to require medical equipment. What can I do to calm my nerves because I do suffer from anxiety super bad but controlled with medication.