Sick for 1 week - Go to see a doctor?

I've had something like a cold for about a week (can't breathe well, coughing up stuff, stuffed nose, headache, chills, pain) and it hasnt gotten any better, just worse. I've had problems staying asleep , and lately my coughing has gone from dry coughs to wet, hacking coughs in fits. I've had bronchitis and pneumonia in the past, im terrified about getting either again... should I go to the clinic and see someone or should I just stay home and rest more?