Thank you very much for the useful information Steve.
The first thing you need to do is to get your blood pressure checked up. Although not very common at your age, but still this remains a very common cause for the symptoms you have (headache/pressure feeling).
Inadequate sleep or anxiety/depression (due to any reason) can also give you these non-specific complains.
The symptom that worries me the most is the black eye you have described --- this is serious stuff an occurs due to fracture of base of skull or trauma to peri-orbital areas.
Finally, ear infections, allergies etc can also give you similar symptoms.
Sometimes, viral infections (which can persist for a week or so) can give you such generalized symptoms and are usually self limiting. However its always better to check with the physician that there is nothing seriously wrong ---- it will put your mind at ease also.
You already have taken two kind of pain medications --- which in case have failed to bring any relief, its better to have this examined clinically by a doctor in terms of a comprehensive clinical examination (including a blood pressure check up as well).
Drink lot of fluids.
All should help.
I would have been worried too if I were at your place, but let me reassure you that this is a treatable condition and carries a good prognosis with appropriate management.
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