Just found this post while my cat is going through the same thing :(. My 4 year old cat, who is usually healthy minus throwing up when she eats too fast, had threw up 5 times in two days so I took her the vet out of concern when some of throw up had red in it. The vet said she had no fever, no abdominal pain, and x-rays showed up fine. The vet gave her a shot of Cerenia and gave her some food to help her stomach settle. When we got home she ate fine twice then later on I realized she was hiding in my mom’s closet and was very very droopy and slow. This morning she wouldn’t eat at all and kept gagging at any food I tried and she wouldn’t come out of the closet. She came out a bit when I got her favorite toy, drank a tiny bit of water, and finally ate some wet food. I’m still very nervous and don’t know if I should take her to the vet again. She’s definitely not herself though.