Hi, I get this, too. Well, at first, I get a buzz from the whey, which I interpret as what other people feel as being energized, and then I get a feeling of pressure around my head.

I think it is a problem with some of the single amino acids such as glutmin that act as excitotoxins.

However, I recently tried organic whey online, on amazon.com, called raw organic whey and in a brown bag. I didn't have any negative reaction this time.