The same information I gave @JoJomoo applies to you, too. Headaches w/ auras are known to be possible symptoms of ES. They often are related to vascular compression, most likely of the internal jugular vein. The IJV can get squashed between the styloid process(es) & the transverse process(es) of the C-1 vertebra, however, there are also other possible causes of IJV compression such as by a nerve, muscle, or scar tissue.
Dr. Costantino in NY would be a good doctor for you to see for an evaluation of your CT with contrast as he deals specifically with IJV compression or vascular outflow obstruction as he calls it.
•Dr Peter Costantino, 4 Westchester Park Dr, 4th floor, White Plains, (914) 517-8056
http://www.nyhni.org/find-a-physician/Peter-D-Costantino-MD,FACS
Here is the link to a post @Jules wrote that will be helpfiul for both you & @JoJomoo regarding symptoms of vascular compression: