Acute Bronchitis, I think. The main symptom is cough. You may also develop a fever, headache, cold, and aches and pains. There's a treatment for acute bronchitis like taking paracetamol, ibuprofen or aspirin for your fever ( if you have) but if you're 16 and below you shouldn't take aspirin. Drink more water. If you smoke, try to stop it. But it's better to go see your doctor.