Breathing issues while sleeping.

1.on may 13th I got high fever and after 2 days am cured,but after on 3rd day at night I started feeling breathlessness like nasal congestion so I inhaled steam for 3 to 4 times and at that night I didn't slept properly but in morning when I used nasal spray I felt relief . 2.but on same day by afternoon I tested positive for covid and I went into isolation and I started nasal congestion for more than 1mnth during Isolation am unable to sleep properly at nights making hard for breathe as my nose and throat becomes very very dry. 3.after 20 days I tested negative but after anxiety issues started for me such as high BP and abnormal heart rate sometimes but meanwhile I recovered slowly.( all reports were normal) 4.but still after 3mnths sometimes am facing nasal congestion as am unable to sleep and post nasal drip for twice or thrice in a day and abnormal heartrate for 2 to 3min. 5.under fan at high speeds am unable to sleep still making breathlessness, plz help me ,what's the majorissue