I am sorry for the trauma and symptoms you are suffering.
Carotid or intracerebral stenosis can cause stroke
but they never are shown clinically with headache.
In my opinion you should consult your neurologist
and your headache should be treated as a primary headache probably chronic daily headache
I think that a combination of medicaments (antidepressant + pain killer) will be efficient
Anyway I don't think the stenosis are the cause of your headache
should be started
Hope my answer help you
Dr Eris Ranxha