I'm not sure of the best group to post this in, can someone please tell me? Or comment on my post directly.

I have an absent (or occlusion) of the left carotid artery, which I have been told is from birth. I also have a strange symptom that when I bend over, lie flat (no pillow), swim freestyle etc my left cheek, and a bit of my neck, swells up then goes away within seconds of me standing back up (which I have been told is blood in the jugular vein). Does anyone else have this condition/symptoms?