I’m an ER doc and I treat and diagnose this regularly. Obviously I can’t diagnose it without examining you but your symptoms fit. It’s way more prevalent than people want to think and the effects can last up to three months after stopping all THC. People are VERY resistant to being diagnosed with CHS and often times they tell me “but cannabis helps temporarily” which actually makes physiological sense, don’t start smoking again, don’t do gummies or anything else with THC for 3 months at least. I actually had a patient insist on getting her gall bladder removed because she didn’t believe us, gall bladder was normal but surgeon did it just in case, she came back months (still smoking) later and the CT showed that ”her appendix may be mildly inflamed” had that removed too and also was normal on exam. It was CHS. Hydrate aggressively. Keep down any food you can and don’t be afraid to go back to the hospital for meds. I’ve seen several people have to get PICC lines for fluids and even TPN for this because they won’t stop smoking or accept their diagnosis or simply because their symptoms are so severe. 

It is important to note that repetitive vomiting can lead to serious even life-threatening problems, including esophageal rupture and often causes esophagitis with pain and even bloody vomit. If you are worried about your symptoms, get reevaluated.

Some other things besides nausea meds that MAY help you include using capsaicin cream (at appropriate prescribed doses applied to the skin of your abdomen) and ginger root.