Hi, I too agree that these symptoms of dizziness, visual impairment etc that you are describing could be of stroke, migraine or tension headache. As you have a family background with medical history of stroke so it is best to get the bug out of your mind by an MRI/ CT Scan of your head and spine or CT angiography with the help of a neurologist who can examine you in person and conduct above mentioned test to reach to a diagnosis and treat you thereafter. Hope this helps.
Jess, do not worry about doctors not believing you. The fact that you have a family history of stroke will over-ride your age. From the information I have read about stroke symptoms, you seem to be having them all. If I was you, I would go immediately to the hospital if you are too weak and don't think you can safely drive there then call an ambulance. Some of these symptoms are also for heart attack. Please follow up