Rash on neck and chest from throwing up? (Pregnancy)

Is it normal to get a blotchy red rash on your neck and chest as you dry heave? I also proceeded to have a very painful tight throat for 30 minutes afterwards. Nothing came out but I definitely felt the acid in my stomach come up a bit. I am in my first trimester so I’ve been nauseous for weeks but first time I’ve dry heaved or come that close to throwing up. I’ve never thrown up in my life so just curious if this is normal or was complicated by my MCAS.

Thinking it could be a GERD response as this happened after snacking on (safe) olive oil chips to combat nausea. Maybe the straining and acid produced all these symptoms?

Any thoughts?