Feeling v worried about one of my cats. Took both for their annual boosters this morning (they are 6 years old). All fine. They were fine when we got home (about 10.30) but in the last 90 minutes or so one of the cats has thrown up a hairball and a bit of puke (not unusual for her at all) and is just generally off colour - sitting quietly in a corner, not coming for cuddles and most shockingly of all rejecting a dreamie which she would usually bite your hand off for.
The other cat is fine. Called vet and they said it's normal for some cats to be like this after boosters but she's never been like it before. I'm worried! She's usually a total character and it's very odd to see her so quiet and still.