FWIW, last night's MRI ruled out brain tumor and stroke. Tomorrow L meets with a neurologist. Because of schedules and proximity during the day, P will accompany L. Best guess at this point on what's causing the extreme dizziness, tunnel vision and head pain: migraines. I'll go there. Migraines are treatable. Brain tumors, not so much.
Finding my first-time read of Mates, Dates, and Inflatable Bras by Cathy Hopkins a diverting jaunt.