Anaphylactoid reacti. Anaphylactoid reactions cannot be distinguished from anaphylactic reactions by the clinical symptoms. The difference is solely in the mechanism by which allergic mediators (chemicals such as histamine) are released from blood mast cells. Anaphylactic reactions are caused by allergic antibody (ige).
Shock. Symptoms of anaphylactoid shock same as anaphylactic shock with low blood pressure (shock), confusion, near loss of consciousness, hives, flushing, itching, swelling, nausea, vomiting, crampy abdominal pain, feeling of impending doom, cough/wheezing/short of breath, throat tightness and even incontinence.