I have had a bad cold for around six weeks now. at first i just had a runny nose and cough, but now i have a headache and feel tired. ?

"bad cold": Colds will only last 5-7 days. Since your symptoms are much longer, you likely have developed bacterial sinusitis. You need to see your primary physician for evaluation. Over-the-counter meds may help in the meantime. Afrin nasal spray used only 3-4 days can especially improve sinusitis symptoms.

Sinus infection.: About 10% of the patients with an upper respiratory viral infection end up with a sinus infection. See your doctor.