Hi there,
Your question has landed in the MS community which is probably not the best community your question will need to be on...but from what i understand if your doctor are saying that you have a microvascular cranial nerve palsy due to being 60+, microvascular cranial nerve palsy is one of the most common causes of acute double vision in the older population. It more often occurs in patients with diabetes and high blood pressure.
Hope that helps.....JJ
PS I can't help with the CTA or Angiogram, sorry!