Does anyone else get this reaction when they donate blood? To my memory (for sure since I have had CFS) I have always started sweating profusely and felt extremely dizzy and nauseous to the point of wanting to pass out about midway in donating blood. After a certain amount of blood has left me it starts, like ten minutes into the procedure sometimes. It made me think of a possible connection between the enhanced vagal reflex and the cause of that... hypovolemia? Just curious if anyone else has gotten this before, and if they had that response before they actually felt sick. Because when my CFS has been the worst it literally feels like I am having that response 24/7. Dizziness, slight nausea, wanting to pass out with fatigue, and body temperature dysregulation.