The most recent symptom,
and one that particularly concerns me, is a peculiar, somewhat intense
and jolting sensation that is best described as an earthquake feeling. It happens mostly at night as I'm sleeping, and makes my bed shake noticeably - just like a seismic episode. At first I didn't notice any real physical feelings outside of the bed shaking, but just had an episode as I was seated in a chair, an noticed that it feels like it may be related to my heart.