Everyone keeps telling me to seek medical attention! I have been coughing with yellow mucus and having flu like syptoms for over three and a half weeks. Last Tuesday, I started getting severe headaches with a stiff neck and throwing up. On Thursday my back felt black and blue and I can't touch it. Now, I am still coughing, have the same severe headache, neck and back stiffness, loss of appetite, nausea and stuffy nose. No fever! I am just not getting any better. What should I do?