Would a brain mri show if blood flow is good through the vertebral arteries? and anything that would cause after images,palinopsia?

Yes/no: A magnetic resonance angiogram (MRA) will show the entire intracranial vasculature. However, I caution you against any half-baked forays into self-diagnosis. With respect to your symptoms, you're almost certain to be wrong. Ehlers-Danlos syndrome is a protean disease, but I doubt that your symptoms are a sign of anything serious. Show your doctor respect by letting him/her do the diagnosing.