A sudden drop in heart rate and blood pressure leading to fainting, often in reaction to a stressful trigger.
Common triggers include strain, stress, long periods of standing, heat exposure, or the sight of blood.
Symptoms include paleness, nausea, sweating, a rapid heartbeat, and fainting.
It’s inconsistent, though. For example, never had issues with the numbing shots at the dentist. One day they start giving the shots to numb me up, and next thing I remember they’ve got me sitting up over a trash can trying to clear the vomit I was aspirating on. Scared the shit out of those dentists.
Once while in middle school I lightly nicked a finger with some scissors - barely even bled. All of a sudden I feel nauseous and ask to go to the bathroom. I manage to get out into the hallway before collapsing to the floor, hitting my head at least twice on the way down and traumatizing my classmates who thought I just dropped dead.
Intelligent design my big gay ass. Damn vagus nerve is a dodgy self-destruct mechanism.
*Histamines. Antibodies are far less disruptive. Histamines protect us from larger invaders like worms and other parasites. Antihistamines antagonize histamines at receptor sites, preventing the itchy, red, swelling reaction we associate with an allergen.
Acktually – IgE(/antibodies) are bound to the surface of mast cells. Antigens/allergens bind to the IgE receptor and actives the mast cell, releasing histamines. Allergy can actually be treated with anti-IgE (monoclonal) antibodies (Omalizumab)!
Reading this as my body went fucking nuclear on me the moment my allergy meds wore off and I was a fucking tears and snot fountain at 1am until I took a Zyrtec until it chilled by 2. Even then, I still have fucking drop going on in the back of my throat... ugh...