Like you said 20 years is a long time but I really don't remember getting queasy at all. I do remember though how much better it tasted to me, kind of cleaner if you will.
Like I said I haven't heard anything bad about distilled only good. I feel better knowing that my water is clean, I really don't like to think about drinking well water or city water that has been treated, like anything we don't know what might be in it.
I am a really healthy person and haven't had any trouble with the distilled water. When I first started distilling if I was out somewhere and drank other water it just tasted nasty to me so I don't drink anything but distilled now.
Good luck with whatever you choose to drink, like you said we each have to listen to our bodies and how they react to things.