Currently dealing with the worst glutening I’ve ever experienced

I’ve been diagnosed for over two years now and since cutting out gluten my symptoms have changed dramatically. My husband and I ordered from our favorite gf bbq restaurant last night that I’ve never had a problem with and takes celiac pretty seriously. They also have the best buns, often making it hard to if it’s truly a gluten free bun. Well last night I’m 99% sure they gave me a full gluten bun. I’ve thrown up now 12 times with no end and sight and the nausea is the worst. Wondering if any other celiacs deal with this and how long I can expect it to last.