It's really because too many things can cause these symptoms. What is the evidence from the tests, would be my first question.
Many cardiac issues are heritable. Carotid Blockage can cause blurred vision and dizziness . You might well see a cardiologist and ask for Carotid Ultrasound. You may as well find out what else is going on with that heart of your. A Calc test to measure coronary calcium, a stress test. You get genetic testing for cardiac disease.
Blurred vision and weird head sensations can be caused by overwork and even just lack of sleep.
You could have an immediate risk factor (TIA) or not, but you have a family history worth tracing for any future medical plans.
Simple resolving stresses on you cervical vertebra could cause you symptoms.
I never mind medical professionals guessing, but I want the science to back it up.