Final answer:
The student might be experiencing migraine with aura.
Step-by-step explanation:
The symptoms described in the question, including flashing lights in the visual field, difficulty with expression and concentration, headache, and nausea, suggest a possible diagnosis of migraine with aura. Migraine with aura is a type of migraine headache that is preceded by visual disturbances, such as flashing lights, and is often accompanied by other symptoms like difficulty with speech and concentration. PE (Physical Examination) and MRI (Magnetic Resonance Imaging) being normal suggest that there is no structural abnormality, further supporting the possibility of migraine. It is important for the student to consult a healthcare professional for proper diagnosis and management.