Shortness of breath wild mild chest pain

Hello doctor. It all started on last 30th October, 1:30AM at the night. I suddenly felt breathless and follow-on was unable to take any deep or short breath properly. Along with it, there were dry cough and sneeze. It lasted for about 2 hours. In the morning, there was no cough or sneeze, but since that day, I've been facing a persistent breathing difficulty along with mild to moderate chest pain. Consulted doctor on immediate basis, he prescribed me some antibiotics and asthma med. I also went under a Covid-19 test and the report was negetive. Anothet doctor suggested me for a Chest X-ray, which was normal, along with ECG and Blood test (HB, WBC, ESR). It's been 14 days, I'm still having difficulties in breathing but the chest is almost gone. There is weakness in my body and even after sleeping pills, I'm unable to sleep. Please guide me in a possible way. Thank you.