MRCP2-3209

A 38-year-old woman is referred to the TIA clinic for evaluation of recurrent left arm weakness. She reports experiencing repeated episodes of left-sided weakness accompanied by a unilateral throbbing headache, nausea, and sensitivity to light. During each episode, she notices weakness in her left arm. Her medical history includes a prior diagnosis of headaches, deep vein thrombosis during pregnancy, and hypothyroidism. She does not exhibit any neurological symptoms at present. Based on this information, what is the most probable diagnosis?