I'm inclined to agree with Hugo - massive venom injection would overload the
body's systems that eliminate such toxins. Renal failure is most often
mentioned as the cause of death, meaning the kidneys basically shut down:

"Human victims of multiple bee or wasp stings have been reported and develop
severe clinical signs and symptoms. Acute renal failure (ARF), usually due to
acute tubular necrosis (ATN) was a frequent complication...." - from
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?
cmd=Retrieve&db=PubMed&list_uids=9509559&dopt=Abstract

Allergic responses would likely be overshadowed by renal failure, unless, of
course, someone developed severe swelling that led to soffocation. The fact
that you're used to being stung is unimportant. What you must know is that
each sting, felt or not,  represents a tiny injection of a toxin that the
body must cleanse itself of, and many, many  of these injections can stress
the body's systems significantly. Remember the "L" in "LD" stand for "Lethal"

 /Curtis Crowell
....Used to being stung by still don't like it

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