I have had to deal with gas/Stasis in my bunnies unfortunetly a number of times, each time i have been able to get their tummies going again within 24 hours, except once.
When I adopted Bo & after his neuter he went into GI Stasis, since he was new I didn't 'know' him yet and didn't catch the signs, he went downhill fast, I took him to the vet and they weren't sure he'd make it
But the Vet I took him to is #1 for bunnies out here (though over an hour drive from me).
Anyways, Bo was cold and i knew that couldn't be a good sign, The Vet told me their temp. drops when the organs inside start shutting down, and that's when they produce chemicals that are harmful to the bunnies, it is my understanding that the chemicals are what kill the bunnies.
Cisapride is what i was given, and what got Bo's guts moving again. That is all I had to give him when he got home the next day. He did however get a shot at the Vet's, but i cannot remember what it was. Because he started eating and pooping on his own after the med's they didn't give him an X-Ray, though they would have if he didn't show improvment.
I am so careful with watching my bunnies eating now, that the first sign of someone not eating, i'm on it.
My "Bunny Kit" includes a Homeopathic digestive upset medication, Ovol, Cisapride, Critical Care, pedialyte and a bunch of syringes and a glass eye dropper. I also have Metacam, but have never had to use it (Or the Ovol yet, as I use the homeo pathic meds instead), I also use a vibrating toothbrush handle to help massage the tummy, and a heating pad for the pain if they want it.
I did take Jackpot to a Vet close by once, even though i had made him all better before we got there. The Vet was a very nice man (the lady i wanted to see was off that day), but sexed poor Jack like 4 times, telling me I had a female bunny.... Untill at the end he's like "oh, maybe he is a boy, sorry about that little guy". My poor bunny. I think it's important to interview vet's before we have to take our animals there, and it's also best to have a person refer you to a vet if they have had a good experiance with them and own the same animal as you.