I've been using whey protein for about 18 months now, but have
recently increased my intake to 3 shakes a day (instead of 2).

After the increase, I've started noticing a rather odd problem,
though. About 15 minutes after drinking it, my face, neck, and
shoulders get a little tingly / itchy / burny. This was particular
tough yesterday when doing bench press; for the first 20 minutes of
the workout, I was so itchy that I couldn't really concentrate on the
workout!

The protein I'm taking (GNC brand) does have a lot of amino acids in
it (arginine, alanine, leucine, and a bunch of other -ines), but not
taurine, and I don't think that any of the others are specifically an
energy booster.

Do you guys think that this is something that my body will adjust to,
or is it an indicator of an allergy or other problem?