So far, most of Randy's reactions were obvious because of the redness he has gotten around his mouth.  But, I learned that the symptoms do not always have to be the same.  They could change at any time.  One thing to keep in mind is that an anaphylactic reaction is systemic.  That means, involving the body systems (heart, digestive tract, respiratory system, etc.)  So, there are many things to watch for.  Here are some I can think of off the top of my head, but you can visit FAAN's site for a better description.

mouth- swelling or itchiness inside the mouth, throat, lips.

respiratory-wheezing as the airways start tightening up.

gut- diareah or vomiting

heart- slowed heart rate as body leaks fluid and lowers blood pressure.

I know I am forgetting something.  I thought I had a list from the seminar, but apparently I do not.  I will get the rest of the information and add it here then.