question: Hi, I'm a 5'7, 130 lb 19 year old girl who recently had my 5th encounter (on saturday) of going unconscious unexpectedly and for 5-6 minutes.  It was around 3 in the afternoon, I was not dehydrated and had already eaten lunch.  I have a long list of allergies; the most dangerous are shellfish and  penicillin.  Every time I come back to consciousness I have large red blotches and hive on my arms and upper thighs.  Previous Doctors have thought my fainting spells were caused my anaphylactic allergic reactions but recently another doctor claimed I have vasodepressor syncope and the hives are caused from over-heating (which I often get hives from).  I was wondering If you also thought I should see a cardiologist or should continue on new allergy medications.