I've done a couple 7 day retreats and have had some similar experiences to the author, though I'd already been doing meditation for a while so was more inclined to "just sit" from the start. The one thing that always impresses me is how much crap gets dredged out of your subconscious. Old fears, regrets, guilt, etc., would come to light and seem like an absolute crisis right in the moment. Then ten minutes later, I wouldn't be able to remember what I was so worried about. Definitely a worthwhile experience, and by the end of seven days, nothing could faze me, everything seemed carefree and effortless.