Thank you for posting your query at DoctorSpring.com.
The most likely cause for your headache could be migraine. Even though you have not had a headache episode earlier, the most common cause for a first time headache of this nature would be migraine.
As of now, you can take an analgesic such as ibuprofen or diclofenac tablet for relief of pain.
If symptoms persist or if the headache recurs, then, it would be better to see a neurologist and get a brain scan done.
As of now, there is no need to worry.
I hope it helps. I would be pleased to answer, if you have any follow up queries.
Dr. Sudhir Kumar MD (Medicine), DM (Neurology)
Senior Consultant Neurologist