I would also look into the oil, what solvent was used in extraction, was it fully purged?

Iso, and Naphtha will both cause belching, with a distinctive taste and odor.
Acetone as well.
Is there an odor?

The reason I ask, is serial vomiting is very unusual with cannabis and cannabis extracts.
Chlorophyll is minor, and seldom more than nauseating.
But un-purged solvents for a person with compromised hepatic function, can be deadly!

Smell the oil, smell the belch, act accordingly.

Just a wild guess, I am not a physician or a chemist.

Aloha,

Weezard