Been coughing off and on for 3 weeks now mostly at night. Sometimes it seems like a tickling cough. Just started coughing up a little stuff last few days. Like orangish brown. A little traces of blood too. The wierd thing is every time I cough it s like I taste blood but there s no blood just traces every now and then when I can cough up stuff. Been on zpac for 5 days and no better. What would cause this?