Thanks Mark. Hopefully I didn't do any long-term damage. I was taking it easy on my rides and started to get slight headaches but ended getting caught up in a group ride that went on much longer than planned.

In the brain I'm wondering how the neurons are affected by all this physical activity. One person I spoke to said that because there are tears in the brain (among the neurons?) that blood wasn't able to flow properly throughout the brain and the results after intense physical activity is a return of the PCS symptoms.