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.