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Regarding what you mentioned

, as a temporary measure we advise you to continue using the analgesic medication to relieve the associated pain and you have to keep the affected eye clean in order to avoid aggravation of the case.

What are the possible causes which may lead to redness of the eye in association with headache ?

• This may be due to bacterial infection of the eye.
• This could be due to allergic condition such as allergic conjunctivitis.
• The symptoms may be due to viral infection of the conjunctiva.

What is the exact cause of this case?

Without doing a full clinical evaluation we cannot determine the exact cause of this case .

What should you do in this case ?

You have to visit the ophthalmologist doctor  so that the doctor could detect the exact cause of the case , then he will treat it accordingly such as prescription of the eye drops that contain a topical antibiotic in the case of bacterial infection.
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