Sharp pain in the side of face could be due to injury t a nerve or pinched nerve, an infection or a trauma. Hence it could be
Trigeminal neuralgia, abscess in tooth, exposed
root canal, internal ear infection, maxillary sinusitis, TMJ, migraine, herpes (recurrent) without rash or fibromyalgia localized to face.
It is difficult to comment beyond this at this stage. A comprehensive investigation is required keeping all the points in mind.