Post covid. What can be the problem.

I have started having symptoms for covid on 10 April and test neg on 3 may and then also I am not feeling well and there is breathlessness and phelgm coming out of my mouth continously then I consult the docotor they said I have mild pneumonia And after that I did and ct scan and infection is 0/25 and now after two months from last 10 days I am facing phelgm again and there is nose block also and there is light pain near the eyebrow. When I cry my nose is fill with mucus and my mouth also then I have to throw it and there is breathlessness sometimes not common but sometimes when the cough don't come out .and sometime sometimes I feel light pain in face and it suddenly goes in just 1 second what is the reason behind this .please help and also I consulted a ent they said they see nothing wrong .what can be the problem .