There are more and more scientific research studies about marijuana hyperemesis, but other than guesses, that the appetite center of the brain undergoes changes with daily cannabinoid use, scientists aren't actually sure why it occurs and why only certain people suffer from it. The resource I give to my patients are the High Times articles from 2014 and 2018. That's a good place to start. As with many newly described medical conditions, there's a healthy amount of controversy surrounding marijuana hyperemesis. If your symptoms come back again, though, the ER should be able to help.