Oohh poor @puravidaville.. I have no idea what happened to you, but you really need to see doctors.. I was guessing it's urtikaria, but with the symptoms you mentioned above, my mind lead me to a silly thought about leukeumia and eritema multiformis.

My sister in law once experienced the same hive after being 12 hours sitting on the train from her home to ours. I gave her anti-alergic pills because I thought it was caused by something she ates before, but then we went to see doctor and found out that it's caused by exhausting.

If it never happened to you while you're still in USA, particular tropical paracites could be the cause of it too. Dermatitis atopi something.