There are many reasons why you might be having the pulsation of your eyes. One of which is something called "cavernous sinus
fistula." This is a VERY SERIOUS problem in which there is a blockage in your cavernous sinus. This is the sinus in your brain who has the responsibility of draining ALL OF BLOOD from you the brain and the eyes. When there is clogging of this sinus the blood pools back to the structures where the blood is coming from. I would highly recommend you to see and OPHTHALMOLOGIST or NEUROLOGIST
Hope it helps.
Dr. Jay Patel