A 26-year-old female is transported by EMS to the ED because she experienced the sudden onset of a severe headache that began after she moved her bowels. She is 28 weeks pregnant. Her husband tells you that she is healthy, takes only prenatal vitamins, and has no allergies. On arrival in the ED, the patient is moaning and does not respond to voice. Emergency medical technicians (EMTs) tell you that she vomited about 5 minutes ago.
What could be the potential causes and initial steps for evaluating and managing the condition?