My sister has it sometimes too, she faints and feels like she's gonna throw up. She had to have a heart monitor strapped to her for 24 hours and they're still waiting on the tests. I just assumed she was being a typical girl about it, she was told that the reason she goes faint and i don't is because she panics when it happens and goes into a form of shock, which results in the fainting and nausea. I enjoy it and use it as an excuse to get out and do something energetic before it finishes. Meh, i like it.... the chance of suddenly dropping dead is only around 0.6% I'm happy with that. I could always go find a power cable and try some self cardioversion