Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to obtain a history from you and examine you, I cannot comment on a formal diagnosis or treatment plan for your symptoms. However, I will try to provide you with some information regarding this matter.
The most common cause of excessive daytime sleepiness is usually due to a combination of not getting enough sleep, inadequate sleep hygiene, and work schedules. There are sleep disorders that are associated with excessive daytime sleepiness, such as sleep-related breathing disorders, such as obstructive sleep apnea, circadian rhythm sleep disorders, medication-induced sleepiness.
Excessive daytime sleepiness is characterized by persistent sleepiness, and often a general lack of energy, even after a good night’s sleep. There is also an intense urge to take naps.
Given that you describe fatigue, one thing that causes headache and fatigue is sleep apnea. This is more likely to occur in overweight people who snore but can occur in anyone. Symptoms include snoring, daytime sleepiness, lack of concentration, and headaches. Untreated, sleep apnea can cause many medical problems, and with treatment many symptoms improve. The diagnosis is made by a sleep study, called a polysomnogram, and treatment involves a mask placed over the nose and/or mouth that is adjusted to improve ventilation during sleep.
I would recommend a PSG (polysomnography), a sleep study in addition to a prolounged EEG which monitors for seizure activity.