thanks for writing to us , you have two different problems , the stuffy nose , sore throat are signs of flu , you would get good relief from taking oral / nasal decongesants and warm saline gargles. the second problem that you mentioned needs further evaluation , injure the diaphragm ? did you have an accident ? either way you need atleast an xray of your chest and need to be seen as soon as possible by a chest physcian / surgeon to rule out any rib fracture / pnuemothorax etc . i hope this helps , please do write in if you need any further clarifications regards dr arun