Considering how long ago that was, it makes me question how properly grown or safe the weed was to be honest lol. I know some people are just insanely sensitive to edibles. A friend of mine ate literally like, 2mg once and he was throwing up for awhile, but not violently.
He was already drunk and the edible hit him 5 hours later, so it's probably more the combo that did him in. Hyperemesis sounds not that likely since just about every case of that comes from people who use a heavy amount, but maybe it is possible for anyone to develop it? That's definitely the most vomit I've ever heard associated with only cannabis though, but if you don't even know how many mg of THC you ingested, which was probably a fucking lot, it wouldn't surprise me. Edibles for me don't stand out much differently, I'm just high for a very long time.