First: I'm not there with you obviously, but I don't think you are going to be sick. You will be fine. If you think it might be due to anxiety, chances are, IT IS!

Now, second, I can't imagine drinking vinegar on an empty stomach is going to be soothing! Vinegar is acidic and you said you were having heartburn before... No wonder it didn't make you feel better (also, colloidal silver is known to cause stomach distress and not known (in terms of evidence/studies) to provide any benefits to an upset stomach... see wikipedia if you happen to want to know more). I wouldn't jump straight to the Zofran. Definitely make some tea and sip it or sip some ginger ale, depending on what you feel like. Take your mind off of your digestive tract any way you can. Read a good book, or watch a TV show you like.

Hope you feel better soon.