Cat Throwing up Right After Eating

I know that I will not find a miracle cure, nor will I be able to get through this without some sort of bill, so I am posting this out of curiosity and worry. Let me preface this by telling a story: I work for a local animal shelter and pet sit on the side, and one day I adopted out a beautiful cat to my mother; she ended up losing her home and I offered to take him in, so he joined a pack of four cats, and him being the fifth, he had to find a new home ASAP. It turns out this new cat had a case of struvite crystals but I believed he was blocked, twice. So I rushed him to the vet, urine analysis, blood work, and x rays for a cat that didn't have a urethral blockage set me back about $800. So I found him a home and life returned to normal, until I noticed my other cat showing signs of being blocked, so I rushed him to the emergency vet. He actually was blocked. He's fine now (thank God) and is currently recovering at the vet as I type this. So, $2,500 later for him plus the false alarm with my temporary cat, I have literally almost nothing left. This leads us into the issue I'm having now, I was terrified of struvite crystals so on the advice of my vet, I tried to switch them to a wet food diet. It started yesterday, I fed my cats each six ounces of Blue Buffalo Wilderness, each was a different flavor; all three of them ate it all immediately, and all of them had normal stool, no vomit, and normal behavior for that entire day, and two of them are still doing fine after their second meal of wet food today. However, one of these cats is having an issue, she ate some of the wet this morning and a few minutes after walking away from it, she threw up the food and proceeded to do that two more times until it all came up. I thought maybe she ate too fast so I offered a rather tiny amount and she ate it happily, and then threw up again. I tried to offer her a few kibbles that she had been doing well on, threw those up moments after eating them too. She's acting completely normal and is more active than usual if anything, and shes begging for food. This is a five year old domestic shorthair, and I'm desperate and unsure of what to do.

There's a few things that can cause regurgitation. One is eating too fast as you mentioned. Feeding small portions may help (even splitting up each meal). Another possible cause is acid build-up from going too long without eating. Cats who have are transitioning to timed meals from being free-fed dry food sometimes have this issue. Especially since you mention that it happened in the morning. How long had it been since the last meal? As you are transitioning them to timed wet meals, you may want to leave kibble out at night for a short while. You can also give them something to absorb the excess acid, like a freeze-dried meat treat, and then feed wet food. There are other tips to transitioning in the thread below. The regurgitation may also be upset from too rapid a change in food. And finally, the most dangerous would be an obstruction of some kind. I would definitely keep an eye on her, but I think it may be the transition.

http://www.thecatsite.com/t/264675/transitioning-free-fed-kibble-kitties-to-timed-meals-and-new-food

Yes, it was a transition from free feeding kibble to timed meals. The last time she ate was at 9 last night, so I suppose it was eleven hours, I'll keep some out at night, but for the meantime should I try to feed her a small amount in a few hours or do I keep trying? I'll definitely keep an eye on her, especially since she's the only one with an issue. 

It really sounds like excess bile. During the transition, it will really help to feed more frequent meals until her system adapts to the timed meals. In the meanwhile, do you have any dehydrated or freeze-dried foods (like Stella & Chewy's freeze-dried raw, Whole Life or Pure Bites freeze-dried meat treats)? If so, I would feed her a piece of that, dry to absorb the acid, and see if she keeps it down. If she does, then you can feed her some wet.

If you don't have anything like that and can't get it today, another option is Pepcid AC (or generic), the 10mg version, AC only, NOT the Complete version. You can feed her half the pill, so 5mg and then feed her a meal. I prefer the above first option as I'm not a fan of medication when other options are available.

I have the Pure Bites freeze dried chicken breast treats, I gave her a couple and she kept them down fine. I tried to feed her the wet and she wasn't interested and doesn't seem to be looking for food anymore, I'll try again soon. Thanks for the advice!

I agree with vBall91.
Ritz has the same problem, throws up if she goes too long between meals.
In Ritz' case, I also think it depends on what I feed her after the freeze dried treat. On weekends when I can feed her more frequently, she can handle venison; on work week days when she goes 12 hours between meals, she throws up vension but keeps down something milder like chicken breast (I fed raw). So you might tinker a little with the wet food you feed her, perhaps avoid strong protein/flavors like fish or beef, until she gets use to timed meals.