From your description this is a very mild headache. A few questions: 1 - do you have trouble turning your head from left to right? 2 - Is your neck stiff? 3 - Do you have a cold or a runny nose? 4 - Are you coughing?
Please answer these questions and I will contact you again. Tizona has a very valid point. Chill out to start then try to get more sleep.