I read your question carefully and I understand your concern.
If the imaging results like CT or
MRI show that there is a blocked blood vessel then the diagnosis has been made, there is no reason to look for other possibilities. Now you should concentrate on what originated this blocked vessel. Looking at your description of pain in the neck and head, one possibility would be a cervical
artery dissection, a rupture in the wall of a blood vessel, with accumulation of blood inside the wall which can lead to narrowing of the vessel lumen as well as formation of thrombi which can cause a
stroke. Of course this possibility should be confirmed with imaging of neck vessels apart from the head.
Other possibilities may be heart issues leading to formation of thrombi which enter the circulation, block a vessel and cause a stroke, or
atherosclerosis of neck vessels which again can form thrombi which can lead to stroke.
I hope to have been of help.