morning sickness?

So with stomach bugs, my partying days, or even years of fighting acid reflux, I know that the feeling that you need to throw up can fee alittle different in each situation. 
But what does morning sickness actually feel like to you? 
So hungry you wanna vomit? 
You spun around 100x and now feel sick? 
Stomach bug? 
Drank too much feeling? 
Smelled the worst thing in the world? 
What is it about morning sickness that makes it different from the rest??? 
All stories welcome