I woke up this morning and had a severe anaphylaxis episode and didn t have anything to eat prior.I ve had this before, especially after going for a run. My throat started to close up and I was very fearful.Symptoms include swelling of throat and lips, loss of color in my face, and severe uncontrollable salivation, heavy mucus production, and a intense burning pain behind my rib cage. What could cause this...especially if I didn t eat any thing before the episode? Thank you