There is no anti- nausea medicine that even comes close to Cannabis.
Its nice that it works for you, but this is far from universal.
If you're not a cannabis smoker don't buy a bunch assuming this tactic will work.
I can think of few ways to ruin a trip worse than cannabis. For me cannabis causes anxiety, anorexia, mild nausea, and insomnia. I cant find any use at all for the stuff.
I'm an extreme case but I've known plenty others for whom it wouldn't help a trip much.