Welcome to this forum, although not good that you have found it as CH cluster headache is a serious thing if you have it.
My first thoughts are to see if you have one or more of the following signs or symptoms:
Excruciating pain that is generally situated in, behind or around one eye, but may radiate to other areas of your face, head and neck
Redness of your eye on the affected side
Stuffy or runny nose on the affected side
Forehead or facial sweating on the affected side
Pale skin (pallor) or flushing on your face
Swelling around your eye on the affected side
Drooping eyelid on the affected side
Diagnoses of CH is done by eliminating possibilities while taking into regard the above symptoms. Especially the first and second may be a first indication for cluster headache, along with a one or more of the others. People experience sometimes different signs because CH can morph over the years, but as a starter you can see if the above applies.
Seriously hope it is not CH and take care the next time you have sex.