Gosh, I'm sorry to read this! This is truly a scary time. I had a cold with sore throat and cough. It was gone and now I have a sore throat again and at night I cough. I mean, I've taken my temperature 10 times. (not elevated). The gasping for air you describe almost sounds like a symptom of a panic attack. I am SO glad that you went and had an x ray of your lung and that they are clear. I have read what this shortness of breath is said to feel like. Kind of like drowning. Which sounds beyond dismal. It's not just not being able to catch your breath. I'd not hesitate to be seen and tested though if this continues. But I must agree that this sounds more like anxiety than covid 19. I hope it gets better. It's a very stressful time and I feel for you.
If you don't have a cough, fever, or even cold symptoms, you probably don't have covid.
Do you have anxiety? Anxiety can cause symptoms like you describe, and panic symptoms can be very scary.