Angioplasty of the brain arteries and Intracranial stenting are new procedures used treating stroke and transient ischemic attacks. Using a small incision in the groin, doctors thread a catheter through the arteries and into the brain. Compared with the carotid arteries, the arteries inside the brain are very small and make a lot of twists and turns, so they're somewhat difficult to navigate with a catheter. Because of this, intracranial stenting requires expertise and specialized equipment.
People that don't respond well to the medicines and don't have diabetes are candidates for this procedure.

I had a small stroke last summer with no known risk factors. My mom sent me to her cardiologist. He is finding some underlying causes that do not show up on the normal medical tests. He wrote a book called "Reverse Heart Disease Now" that may give you some background information.

I would look for a second opinion, and look for someone who is open to alternative treatments as well. This doctor got tired of having to repeat surguries and after looking at some nutritional therapies, he has incorporated them into his practice, and as a result, his hospital admission rate has gone down, and his patients are getting better.