I think it's more common than you think darling! Don't fret. I am 20, and when I was 18 and new at giving blowjobs I was deep throating and he kind of thrust into my mouth and I threw up all over his legs and stomach. :( My friend is 28 and she recently also threw up on her BF while giving a blowjob.

The forcing you to deepthroat causing discomfort and making you throw up IS NOT OK! That wasn't ok. A guy should respect you, and your limits, and not do anything that could make you feel uncomfortable or that you didn't agree to without your permission first! That was disrespectful to you as a person, and sexual partner and not ok.

The throwing up though is nothing to be embarrassed about, fret over, or let you stunt your sexual growth. If you decided now blowjobs aren't for you, that's ok! Don't do them, no one should ever do something they aren't ok with, and just find partners who are ok with that situation. If this is just due to being "shaken up" by the encounter and you might want to perform oral again, then I say don't fret darling :) What happened is more common than you think, it's ok, sex is sometimes messy, and gross and it's nothing to be embarrassed by or let it hold you back. I wouldn't worry about what happened, accept your limits, and enjoy your sexual future as I promise within even a couple weeks you won't be thinking of this encounter and might even laugh thinking back on it.

If you decide you want to give blowjobs again just make sure guys stay within your limits, and slowly and gradually reintroduce them at a rate you're ok with, and eventually I am thinking things might go back to normal.

I hope this helped, sorry if it didn't and I wish you the best :)