You have a lot of symptoms and I can understand your concerns regarding this.
If you have vertical diplopia, blurry vision, headaches, pins and tingling in your hands and feet, then please do not drive.
My first question is how serious are the low lying tonsils? If they are really low lying, then your symptoms could be due to this problem. It is also called Chiari malformation. The symptoms can range from various neurological problems to dizziness, diplopia, blurry vision, headache etc. This is usually managed by surgical intervention. So, please ask your doctor regarding this.
Since you also have headaches, benign intracranial hypertension should be ruled out through a spinal tap. Headaches in this case are worst in the morning and at night and increase with strenuous activities.
If you had a recent TIA then this would have caused an aggravation of symptoms. The only thing that goes against it is that in TIAs the symptoms do not persist. Also, your MRI does not show any recent brain injury or hemorrhage or trauma. If your doctor feels the TIA occurred after the MRI, then also, usually, the symptoms do not persist for a week.
Diplopia and blurry vision can also occur due to refractive errors of the eye, dislocated lens due to muscle weakness, squint, and cataract. So please also consult an eye specialist.
Since you also have pins and tingling and a general feeling of being unwell, other causes of diplopia and blurry vision such as thyroid disorders, diabetes, atherosclerosis, multiple sclerosis, temporal arteritis and hypertension should also be looked into. Please also consult your doctor regarding this.
I sincerely hope you will find this information useful towards achieving better health.
Hope you get well soon! Good Luck and take care!