I would see a doctor.... infections in the intestines, like appendicitis, or diverticulitis, or gall bladder stones, infection there, or pancreatitis, can all cause a tight abdomen as the muscles get spasmed above where the irritation occurs.
The vomiting is concerning and should be reported to the doctor too.
Get a blood count with differential, and have the doctor examine your tummy (palpate it)...
this link gives other causes in more detail:
http://en.wikipedia.org/wiki/Acute_abdomen
If you are still taking 3 of those AOR B-complex as you told me earlier, I'd stop that for now. (one of those a day would be plenty for most people.
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Weezie looking at petunias 8.25.2017
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