Chaotic42,
If you still have this intense headache with nausea, consider seeing a physician. It may not be as bad as glen suggests, but severe headaches are concerning, especially if you've never had it before. It's hard to diagnose you without getting a more thorough history and doing a physical exam. For all we know, it may just be severe tension headache.
Other things to consider:
1. meningitis (as glen suggested). Usually with fever, stiff neck, headaches, nausea. May have a rash if it's caused by the bacteria Neisseria meningititis. Can you lie flat on your back with your legs straight and still be able to bend your neck?
2. migraine headaches. Very common. also have nausea, visual aura. aggravated by light and noise. improves with sleep, lying in a quiet room. Pulsatile. Usually occurs behind the eyes and around the temples. gradual onset, lasts from hours to 3 days.
3. cluster headaches. headaches that come on in a bunch. occurs several times a day for weeks or months at a time. and recurs at same time of day. Inhaling pure oxygen will relieve symptoms.
4. tension headaches. Most common. not very severe. chronic or periodic.
5. dental disease
6. temporomandibular joint disease
7. blood clots
8. aneurysm
9. intracranial hemorrhage. Subarachnoid hemorrhage --> people tend to describe as having "the worst headache of their life" with sudden onset.
10. tumors
etc etc etc
The point is...there are many potential causes to your headaches. If your headaches still persist, I strongly recommend seeing a physician or going to the local ER.
glen, just because you've had meningitis, it does not mean that chaotic42 has it too. don't jump overboard. you're a first year med student and you still have lots to learn. don't try to scare people to death by jumping to conclusion.