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Thanks for contacting with your health concern and after reviewing your case history, I'm of the following opinion:
1. as symptoms are sudden in origin with neck
stiffness, fever,
photophobia thus an immediate visit to ER [emergency room] is warranted to exclude
Meningitis.
PS. photophobia can also be caused by a migraine or due to an infection or inflammation that can irritate the eyes.
2. As because of studying and physical exertion did earlier it could be simple
Tension headache but as a routine, I do check the following signs in my patient:
i. check blood pressure.
ii. check sinus tenderness over maxillary & frontal sinuses and look for any focus of infection in teeth, tonsils, and ears.
iii. check tenderness on the nape of neck or pain on neck movements.
iv. look for any painful/red-eye and [if present] ask for ophthalmologist opinion.
PS. An immediate
Neurologist opinion and C.T. scan [if needed] is required since best treatment is to address the underlying cause.