SLEEVE SISTERRRRRRRRRR!!!
I have thrown up MANY a times from being sick from migraines, gallbladder issues, random nausea, nausea brought on by meds, etc. What I've noticed is that if I didn't eat too recently, I'll just get stomach acid, whatever I drank, or some clear foam. When that's the case, sometimes I've had to stick my finger in my mouth and make myself throw up because of the dry heaves. If I have eaten recently, OH **** it's on!
I actually think it's easier for me to throw up now since there is so much less food. It's easier to just get it over with than to deal with the nausea.