Welcome to healthcare magic.
Your main symptoms are headache especially behind eyes( retro orbital) and neck stiffness which makes me think on the lines of a meningitis
. It could occur as a sequalae or as a part of rickettsial fever
. A CT of the brain could probably help to pick up signs of inflammation. A Cerebrospinal fluid
examination may also be useful to differentiate from other types of infection.
Hope this helps you.