Please anyone who has experience with this, I need help, or at least
reassurance.

I took Sweety - 2.5 year old ragdoll - to the vet today for her yearly
vaccination. She got something called Nobivac Tricat (for feline
herpesvirus, feline calicivirus and feline panleucopenia). 3 hours later
she started having diarrhea and vomiting. I rushed her back to the vet.
He gave her a shot for infection and to stop the vomiting, then told me
to take her home and keep her cool (we're in Spain and it's *hot* here
right now). He said her color (gums) was good. She was panting, but she
always pants when she's scared or excited, so we think that was not a
problem. He gave her Primperan for the vomiting, and I'm not sure what
the name of the drug against infection was. He gave me a syringe with
another dose of the same medicine to inject her with in 8 hours.

I took her home, and about an hour later she tried throwing up again.
There wasn't anything in her tummy so all that came out was a bit of
foamy liquid. But at the same time her read end started leaking bloody
diarrhea. It was just mucus and blood - there was nothing left in her
intestines by this point. I called the vet again, and told him this. He
told me to give her Flagyl (http://en.wikipedia.org/wiki/Metronidazole)
and Sucralfate (http://en.wikipedia.org/wiki/Sucralfate). I am familiar
with both of these - I've given the Flagyl to her when she had bloody
diarrhea as a kitten, but then it was just a few drops of blood, not a
whole puddle of blood like now. He said to call him in a few hours again
to tell him how she's doing.

What else should I be doing? She's not drinking, and with the vomiting
and diarrhea she must be dehydrated (although she wasn't when I took her
to the vet - he checked her skin). I tried offering her water, ice cubes
in the water, freshly made chicken broth (cooled)... she won't even
sniff at anything. Should I syringe water into her?

What else do vets normally do in these cases? Should I take her to
another vet? Just treating the symptoms of vomiting and diarrhea doesn't
seem enough... but maybe that's what is normally done and I am just too
crazy with worry...

Nadia, Kotyo and a very sick Sweety

--
Little Monster pictures: http://picasaweb.google.com/nnakova/Kotyo
Sweety pictures: http://picasaweb.google.com/nnakova/Sweety
Kotyo and Sweety together:
http://picasaweb.google.com/nnakova/KotyoAndSweety