I Have A Hiatal Hernia. Tonight I Had 2 Bites

I have a hiatal hernia. Tonight I had 2 bites from something at a restaurant and now I have incredible reflux. Can't keep water down. Feels like it gets stuck in my throat and I have to spit it out. ate half a cracker and my stomach is a mess, keep spitting out saliva and any liquids that come up from my stomach. Not vomiting, more like air keeps bringing it up