Right now, i have played approx. 600h in the EA with several different classes (but never went into the underdark or freed Halsin, I always restart before going to the Goblin encampment, as I do not want to spoiler myself too much before Full Release).

Normally I never use the Tadpole powers and usually kill Lae'zel on the ship to get her armor, as for me the character is not interesting, so I also usually do not use the Tadpole to communicate with her when she is in the cage with the tieflings.

So I never triggered the "feeling sick" scene - except for my last playthrough. On my last playthrough, I deliberately used the tadpole powers, and only discovered then that the scene even existed.

At the beginning of playing EA I really disliked the story telling, as a lot of the story content seemed so disconnected, awkward and clumsy. I thought this is due to the game beeing in EA, before realising this is because I have to rest much more.

So after the first two runs, I deliberately worked out a plan when I had to rest and how often, so that I could see as logical and complete an order of the camp scenes - a.k.a. the story itself - as possible.

e.g.:
SH joins --> rest
Gale joins --> rest
Astarion joins --> rest
One comes to the Grove, picks up Wyll --> rest
You finish stuff in the Grove and go towards the Blighted Village --> rest (Raphael scene)
Discover boar --> rest (Astarian Vampire reveal scence)
Go to owlbear cave / Selune shrine --> rest (SH Shar reveal)
etc. etc.

So even before I get to the blighted village, with Gale, SH, Astarion in the group, I have to rest 7 times. 7 times! If I DON'T do it this way, then later scenes and/or comments from companions MOST OF THE TIME / ALWAYS don't make sense because previous scenes have been skipped.

IMO this is definitely BG3's biggest problem at the moment.

So as for e.g. the "feeling sick" scene --> maybe always trigger it on your second rest? As I also feel the dialogue the next day dampens the feeling of urgency a little.