Clogged Nose and Throat, Chest Pressure.

I had a fever on 5th April went away in next 3-4 days, in May got myself checked for covid, test and scans were negetive. Lost smell and taste ,it's back, I never had a good sense of smell ever but it was gone during this period.On April 28 and May 5, I had a bad palpitation, sweating, dizziness, BP was 139/110, SPO2 and pulse was 98+. I have a clogged Nose, sometimes a sore throat, a little irritation which lead to a rare dry cough, been experiencing a little chest pressure. Had met a doctor who said it's sinus,on med oncet3d eating healthy but I feel a little pressure and sometimes feel as if am not able to breathe or gasp a stomach full of air ,a little weakness. SPO2 is 98, BP is 144/107 Pulse 115+. One second I feel I forgot to breathe and next second am ok. Breathing exercises are sometimes ok sometimes they give me a dizziness , a little effort sometimes is all ok but at times give me breathlessness. Please help ! Thank you!