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A 33 year-old woman with history of tension headaches is brought to the ED complaining of the worst headache of her life that started roughly 10 hours ago with no response to analgesics. Vitals are normal except a slightly elevated BP and a pain score of 10/10. She is unable to flex her neck due to pain and also complains of nausea and vomiting. A brain CT is ordered with the suspicion of SAH which is reported as having no significant abnormalities. What is the best next step?