After 10 days of cough a bad smell is from my upper nose. This bad smell is coming when I down my head. Some times cough mixed with blood also.

Sinus infection? Sinus infections may cause nasal congestion, post nasal drip (drainage runs to the back of the throat), sore throat, cough, and difficulty breathing. I am guessing that may be the problem, but you need to be examined and treated. Good luck. Lgromkomd.