Angioedema: Angioedema is a severe swelling beneath the skin, especially of the face and the limbs. Sometimes, rashes also appear along with the swelling. Other symptoms are swelling of the eyes or eyelids and lips, stomach cramps, and difficulty breathing.
Emotions, like fear and love, are carried out by the limbic system, which is located in the temporal lobe. While the limbic system is made up of multiple parts of the brain, the center of emotional processing is the amygdala, which receives input from other brain functions, like memory and attention.
The brainstem is the region responsible for the emotional reactions, (indeed, they are just reflex answers) of inferior vertebrates, like reptiles and amphibians. The involved structures are the reticular formation, and the locus coeruleus, a concentrated mass of nor-epinephrine secreting neurons.