hi
I also had sever pain on right side of face, neck shoulder and behind right eye. Been to several neurologists, ophthalmic surgeons, ..... many many doctors. Had CT scan, MRI scan, no diagnosis. Eventually chiropractor suggested it may be problem with Sternocleidomastoid muscle. This muscle refers serious pain to face, eye, under eye, behind eye, neck, shoulder, tingling on scalp , pain on right temple and headache. If you run your hand along your neck (that is the cleido muscle) - u will feel pea-size bumps. This is the trigger points that causes pain. See a physiotherapist and chiropractor who can help with this problem. Good Luck