Started with heart palpitations and what I think is a chest sprain. One night the twitching in my chest freaked me out. I was shaking, panicking, and thought I was going to die. It happened again two days later went to the ER. They ran blood tests, ekg, and chest xray. They said everything looked normal and that I was having an anxiety attack. I immediately set up an appointment with a psychiatrist.  The time between seeing the doctor and setting up the appointment I had three panic attacks a week. Just received some Zolaf and Clonazepam. I also have a primary care physician coming up in a couple weeks.  My issue is sometimes I feel like I can't breathe despite breathing exercises and getting enough air. Is it all in my head? My oxygen levels are 99% on the pulse oximeter and my heart rate is decent during this air hunger.

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tldr: Severe panic attacks. Why is my oxygen level and heart rate good yet It feels like I'm not getting enough air.