Have had a severe cough for three weeks causing head aches and sleeplessness?

I'm not a doctor, but a severe cough lasting three weeks, especially if it's causing headaches and sleeplessness, could indicate an underlying issue such as an infection or Allergies. It's important to consult a healthcare professional for an accurate diagnosis and appropriate treatment. In the meantime, staying hydrated and using a humidifier might help alleviate some symptoms.