Some general observations (sorry this is so long):
1. There are, of course, many different causes of headache and the vast majority are benign.
2. A temperature of 100 is not truly a fever as normal body temperature varies by more than a degree beyond the average temperature of 98.6. If the temperature gets to about 100.5 - 101 in an adult, it would be considered a fever.
3. A classic migraine headache has some neurologic symptom which is then followed by the headache. There are many possible neurologic symptoms, but eye symptoms are very common, typically seeing light or dark spots or even transient difficulty seeing, but not a burning sensation in the eyes. The headache is typically on one side of the head. It is commonly associated with nausea and vomiting. Most migraines do not follow the classic pattern and present with the headache without neurologic symptoms. Migraines also tend to be recurring and it is the recurring pattern that is more diagnostic if it does not have the typical classic features. It is not typically associated with a stiff neck or a fever, unless there is another illness going on. A person who suffers from recurring migraines will frequently get a headache with a viral infection, for example. The treatment for migraines depends upon the frequency and severity, and the only comment that is worth mentioning is the use of Excedrin or any other source of caffeine. Since migraine headaches are vascular in nature, the caffeine does help relieve the headache, however, if the headache pattern is more frequent, leading to frequent use of caffeine, it frequently causes a caffeine withdrawal headache virtually identical to that perrson's typical migraine headache. The most common cause of daily headaches is caffeine withdrawal and no other medication will effectively stop the daily pattern until all caffeine is stopped. Certainly, if your headaches are infrequent, the use of caffeine is fine, but be aware and cautious if the frequency is increasing.
4. Muscle contraction headaches (also known as tension headaches) usually are in the neck and back of the head. They do not necessarily occur at times of stress and they also tends to be a recurring headache.
5. Sinus inflammation, such as by infection or allergy, frequently cause headache and can cause a burning sensation attributed to the eye, but actually from sinuses that are above, between and behind the eyes. The deeper sinuses do not necessarily have nasal congestion or drainage.
6. A viral infection can cause headache, nausea, vomiting, fever, and sinus inflammation, and is very common.
7. A fever associated with neck stiffness (not just a neck ache), nausea and vomiting can be a sign of developing meningitis, typically progressing to confusion and altered mental status. Of course, if you have failed to follow Pete's admonition against the lakes, an amoebic meningitis, although rare, is possible. Meningitis is mor common in children than adults. Symptoms suggestive of a possible meningitis infection should not be discounted for any great length of time.
Yes, I am a doctor.
Thanks for the pixie dust everyone. 
