Kitties can certainly get into things (string especially) that can cause blockages. I am glad you are separating your kitties, I think it will give you some idea of what is going on.
14+kitties mentioned the vaccine. It is quite possible your kitty may have a reaction to the needle. It take Sweet Pea and Snowball  , a couple of days to get over a vaccine.
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Cat maid to:
Rose semi feral, a cpietra rescue, female tabby (approx 13 yrs)
Jasper RIP (2001-2018)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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