I have the same problem. My doctor told me that it is a common condition among women, however some men can be affected as well.
Basically it boils
down to stress
. It also can have something to do with what you eat. Some foods, like spicy food, can raise your blood pressure as well as your heart rate
, so keep this in mind.
Your boyfriend should keep a diary of what he eats and he will start to see a pattern of when he has these occurances.