I suffer from diagnosed generalised anxiety disorder (GAD). Weirdly that second trip was actually much more relaxed and enjoyable during the trip than the first alone with just my wife on the canal boat, even if I did almost pass out at the start.
[0] https://en.wikipedia.org/wiki/Motion_sickness#Defense_agains...
I went on to have a wonderful & memorable experience, feeling closeness & positivity with every human interaction for hours. The worst part after I got over the initial freakout was coming back down. I've heard people talk about such early-stage freakouts happening on other psychedelics, too, but I don't have much experience there.