Post tape worm treatment in cats and they are now sick?

Kidsandliz went on a bit of a rant said
5

I know there are several of you on here who know a lot about cats. My 17 year old (so going to have to treat the rest of them too) got tape worm from fleas (these are indoor cats only) from when I boarded them at the no kill shelter (free for me since I used to volunteer there) when I had a bunch of out of town dr apts (in the town the no kill shelter is). She is now really lethargic post treatment, not eating, drinking water…

She stopped eating 4 days ago (so syringe fed her after the first day and a half), was distended, constipated, etc. so Monday I took her to the vet. She got an enema, tested pos for tape worm and ended up very dehydrated (so did sub Q fluids using what I have for her litter mate who is in stage 3 kidney failure once I got her home from the vet Monday afternoon - she is far less dehydrated now).

Treated her for the tape worm on Monday afternoon after the vet visit and she got diarrhea, was incredibly lethargic (a bit better today but still not good), not drinking or eating (so continued to syringe feed, sub Q fluids) and she hangs out at the water dish (not drinking so I presume nausea even though I have been giving her cerenia for that).

Called the vet this morning (we don’t really have any good vet care in this town. Good vet care is about 90 miles away, This one is the best of the lot but he prefers farm animals although does dogs, cats, etc. too). He is gone from the office doing farm animals today. I am picking up an appetite stimulant for her today. He said well just leave her (he won’t be there all day) and he’d run some blood work when he got back - at what time he had no idea, he wouldn’t guarantee someone would syringe feed her small amounts multiple times a day (so she keeps it down) which I think is a problem. So I made an apt for tomorrow when he will be back in the office. Any messages today are relayed through the desk clerk, who is not a vet tech, and so not sure the extent to which she relays details. I would prefer to talk to him but that apparently is not possible.

Does anyone know how much of this behavior is normal post tape worm treatment (the pill, not liquid treatment)? How long does this kind of stuff last? The credible sites on the internet are kind of vague although she does not have the “take your cat to the vet now” symptoms, it seems like some cats don’t feel well after being treated (the other times she had been treated she bounced right back, this time she is worse off and isn’t, of course she is 3 years older this time around from the last time).

Thanks.