I have been suffering from severe cough for almost 3 weeks. Yes , atleast 20 days. I have done nebulizer, stream, gargling etc. The cough is severe at night. I get mild yellow sputum. When I get coughs, it's severe and I feel breathlessness (it's very hard to even sit). No fever, no other signs of covid19. It's just severe cough and makes breathing very hard. No travel history or exposure to anyone. No fever or bodypain. Please help