Sharp pain in the side of face could be due to injury to 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.
I think you should discuss these possibilities with your doctor. It is difficult to comment beyond this without examining.