Can green tea on an empty stomach cause vomitting?

Your green tea shouldn't have made you vomit. If you have had it before with no ill effects it shouldn't have been an allergic reaction.

If you don't like it there is no reason to drink it. Black teas are just as good and apart from the caffeine content which can make people feel alert for a bit, none of them contribute to weight loss. It's a fallacy.

Some people are allergic to Splenda and the jury is out on it's safety (although I put it on fresh raspberries!).

About Splenda...

"Evidence that there are side effects of Splenda is accumulating little by little. Sucralose has been implicated as a possible migraine trigger, for example. Self-reported adverse reactions to Splenda or sucralose collected by the Sucralose Toxicity Information Center include skin rashes/flushing, panic-like agitation, dizziness and numbness, diarrhea, swelling, muscle aches, headaches, intestinal cramping, bladder issues, and stomach pain. These show up at one end of the spectrum — in the people who have an allergy or sensitivity to the sucralose molecule. But no one can say to what degree Splenda affects the rest of us, and there are no long-term studies in humans with large numbers of subjects to say one way or the other if it’s safe for everyone."

I should think you had a tummy bug of some sort, or the lack of a good night's sleep caused your nausea. Or stress.

If we have a bit of infection brewing it often manifests itself in insomnia.

I don't think it can be the tea.... especially not after only 15 minutes.

yes, it is the tea.. most people don't know about it, but polyphenols in the tea case excessive stomach acid production, so if you have sensitive stomach - you will barf!