I'm guessing the "convulsion" he's talking about was just adrenaline tremors. I had these a lot after panic attacks, my legs would shake like crazy. The thing I

I'm guessing the "convulsion" he's talking about was just adrenaline tremors. I had these a lot after panic attacks, my legs would shake like crazy. The thing I read that basically made them disappear was that if you watch animals like a zebra or something after they been chased by lion... they usually twitch and shake all over. I used to get really upset and more panicky when they happened which just made them even worse. It's a completely normal response after an adrenaline rush and it's actually a sign that your body is calming down.