My girlfriend has a weird kink and I’m not sure it’s safe to continue

We’re both in our twenties and have a lot of sex, we both love rough, sloppy and messy sex, and some degrading (calling her a slut, whore etc.) but yesterday she wanted to try something new. She wanted me to use her throat without giving her any time to breath, and not to stop until i’m finished. I got uncomfortable but she said she’d hit me 3 times if she wanted me to stop, which made me feel better. I decided I’d finish fast and not hold back to get it over with, and after a few minutes I finished and she puked on my penis. She told me that it was amazing but I still feel uncomfortable. She wants to do it again but I’m not sure if we should, opinions?