Yes, it has happened to me a few times. A terrible feeling, intense nausea. I agree with people who mentioned water, water, and more water. What I realized about myself it this... I loved smoking, but was always slowed down by the chemical and smoke making me feel a little crappy. SOme of those chemicals are addictive. You may vape and vape because you are chasing an accelerant chemical that is in analogs, but is not in e juice. After, I found, six weeks or so, you don't crave the extra chemicals as badly, and become more of just a nicotine addict. Drink water, and plenty of it. I will drink a ton of water, pee a lot, and still have a medium yellow color to it. Sorry to be nasty, but the point is that, even though I am drinking so much water, there still is plenty of stuff to be filtered out, from vaping. Another one, and this is a big one for me when I discovered it, is, because I vape sweet flavors that I really like, I found that I will vape way to much when I am hungry. I will force myself to put down the PV, and go eat something. Of course, after I eat, I will have a vape, but I will be satisfied by it, and not chasing the flavor. If you find that eating and drinking water does not work, and you don't want to take a break vaping, buy some zero nicotine liquid and switch between it and the nic. Good luck