Been coughing up white stuff a week now.?

At first I just had a cough then within a couple days I was having nonstop coughing fits. About 2 days into the cough I started coughing up white mucus like stuff. My saliva also became extremely running to the point it was like water in my mouth. I also got an extremely runny nose also not far from water. Then on the 3rd day everytime I would cough it would make my head hurt ( like a headache but not). I have also been waking up in the middle of the night with extreme shortness of breathe. It seems to be worse in the morning and when im going to sleep.