I'm a 25 year old male, and I experience this as well. I find it kind of disturbing how rare it is. The serverity and length of my "attacks" vary but I tend to get anywhere from 10-20 a year. I seem to remember it being more frequent as a child, but it seems to be making a comeback. I've never brought it up to a doctor and very rarely tell any one about. Those I do tell look at me like I'm a bit crazy. I told my mom about it once and she seemed to think anxiety
attacks. I am not an anxious person, so I'm not sure thats true. I can't seem to find any constant with the "attacks".
I would be nice to find out what this is.