Same thing happened to me, my wife and toddler son at Wendy's in 1978, a night in the E.R. trying to get rehydrated and I said the same thing, "never again".
37 years later and I still haven't set foot in a Wendy's again.
Poison me once, shame on you, poison me twice, shame on me.
How do you know for sure that you got food poisoning, as opposed to a norovirus with similar symptoms, unless the food was actually tested for a bacterium?