Temporary jerky use of right leg and arm (3 diff times) making it impossible to walk (lasts 3 to 5 minutes). Takes rest of day to totally recover. Stroke eliminated at ER although these are stroke symptoms. Eyesight blurry in left eye, slight headache, nausea, head feels full. When event happens causes trembling in left hand. Body feels ache like when have flue. CAT scan and MRI clean. Carteroid artery clean and okay. Do not have A-fib. Been going on several weeks. Can this be caused by a virus or infection and can that be determined by a blood test? Am trying to find possible causes.