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May 31, 2009: Concussion from syncope due to low blood volume resulting from severe dehydration. Occurred after finishing my 9th marathon. 100% of symptoms cleared by August 2009.

December 15, 2009: Major surgery due to diverticulitis. 6 weeks after surgery, dizziness, fog, cognitive difficulty, anxiety, some panic, lots of headache. These symptoms largely gone, but still cannot exercise above a very low threshold otherwise resulting in severe headache and cognitive fog. Same for overwhelming odors.

Meds: Nortriptyline and Naratriptan as needed to rid severe headaches (exertional migraines).