Basically your body is super tense up, heat beats faster, blood pressure rises, you do a lot of involuntary actions which produce stress and can feel painful. Then when you eventually vomit, your body relaxes and releases endorphins which give you a sense of euphoria and relief.
More complex explanation: [Here](https://www.reddit.com/r/NoStupidQuestions/comments/3w5w09/why_do_i_instantly_feel_so_much_better_after/cxtnvs3/?utm_source=share&utm_medium=ios_app&utm_name=ioscss&utm_content=1&utm_term=1&context=3)
1. you feel dizzy (for any reason)
2. body evolved over thousands of years to correlate that dizzy = ate something funny, like rotten food, etc. (it doesnt have to be the case, for example you could be riding a rollercoaster, the body doesnt know)
3. ate something funny > vomiting will help get rid of it
4. vomiting
5. you vomited – this should’ve gotten rid of anything funny you might’ve eaten. that means you can stop being dizzy now. (body releases stuff to your blood that stops the dizzyness)
2 main reasons.
1. Your body knows vomiting is not pleasant and it hat you don’t like it so your brain will start producing endorphins to help relieve the stress and cope.
2. If you puked then either whatever is making you sick was just puked up or was making a biproduct of what was making you sick in either way it had to go and now it’s gone
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