Just ride this part out, it probably won't be this intense for too long. The initially shock threw me in to a for about 3-4 days. After that it slowly settled down - it wasn't good, but it was no longer totally destabilizing.
Your mind and body are reacting. Just ride this bit out. This is the "amygdala is in full alert" and "temporal lobes are down" stage. Hang in there for a bit, your physiology will return to your current baseline in a few days and you'll be able to process the news a bit better.