Our cat just developed similar symptoms following her yearly vaccines. Had to have her back to vet who thinks she had a reaction to vaccines. More than likely happened this year since she's had kidney and age related health issues and her immune system is weakened. Since your daughter's cat is FIV positive, he could be experiencing the same thing. If you haven't already, and he's not improved any, get him to the vet. Our cat was put on meds to help with the reaction and address the lack of eating and drinking. She's making a slow, but noticeable improvement. Good luck!
Thanks for the advice!!! He is slowly improving. He is now able to eat and is not in such a noticeable pain. He's even wanting to play a little. She is still planning on calling the vet on Monday and talk to him about all this and to have this put in Midnight's records of how he reacted to the vaccine.
yes please phone the vet on Monday and let them know abt this and also get some pain meds if he's not better.
I had one cat a few years ago that reacted to vaccines...only for her it was bloody diarrhea. So my vet only vaccinated her every 2 years thereafter and also used one that was easier to tolerate(yes they do have a choice what to use)
good luck....
and bless you both for adopting midnight he needed someone to care!