@uzairkashtwari92- I understand. I find that when I don't have answers to a symptom I tend to think the worst. Recently I had a very unexpected vertigo incident that set off a migraine. Even after seeing my doctor I felt as if they were missing something and that something was very wrong with me. But it was a simple "earthing" and I'm back to normal now. Please at least try the breathing exercises suggested in this post. If it's not too hot perhaps take a slow leisurely walk and practice your breathing. Keep on pushing your doctors for answers. What did the last doctor you saw say?

Especially before coronavirus hits. That could spell lots of trouble for those with shortness of breath.