Er said migraine variant, then tia? But no, not TIA bc CT was clean, now maybe MS (so that = mri)--just want 2 know why l arm weak/numb & l eye blurry

Complex migraine. Your description sounds like a complex migraine but you need to complete the workup to rule out cerebrovascular disease and multiple sclerosis.
Not a confusion. Migraine can produce an ischemic event that appears as a tia. This will not show up on ct or even MRI in most cases. The clinical symptoms are adequate to diagnosis the condition. More serious causes need to be ruled out such as heart disease, blood pressure disorder, clotting disorder, diabetes, etc. Aspirin is the safest treatment. A thorough evaluation is needed.