Vomiting and diarrhoea 15 year old cat

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Looking for some advice please. My 15 year old female cat has been unwell for a couple of months
Initially poor appetite, weight loss, vomiting and diarrhoea.

Bloods showed normal kidney function and no evidence of diabetes or hyperthyroidism. Her urine culture showed a UTI and she had 14 day course of antibiotics which finished 5 days ago.
Vomiting improved a little on the antibiotics but still had diarrhoea a couple of times a day- often not in the litter tray. Her appetite us improved but she is vomiting every day and very loose stools all over the house.
We have changed to royal canin digestive food and she has had prebiotic but nothing has helped.
I called the vet again at beginning of the week and they said it will be antibiotics but she is no better off antibiotics.

We will have to restrict her to part of the house as the carpets etc will get ruined.

Any suggestions as to what can be causing this or what else we can do?
I will call the vet tomorrow again but think they are fed up with me phoning as she is still eating and drinking. She has never had any health problems before.

Thanks

Have they done an ultrasound on her tummy to check there’s no blockage? Our cat was vomiting a lot but otherwise totally fine, all bloods clear, eating and behaving as normal, no weight loss, and when we pushed for further tests they found a mass in her intestines. It was awful (she was only ten) but I am so, so glad we advocated for her.

Has she been checked for pancreatitis?

Thanks
I don't think she has been checked for pancreatitis. She also hasn't has a scan- I wonder if it could be an intestinal blockage. I was reading that intestinal lymphoma are relatively common in older cats. Think I need to be more insistent with the vet.
@Judystilldreamsofhorses was there treatment available for your cat?

Really sorry to say that it was intestinal lymphoma we had. It was diagnosed almost exactly a year ago (Easter holidays last year) and an awful shock as she was otherwise so "well" in herself. We could have done chemo or steroids but the prognosis even with aggressive treatment (that she would have found incredibly distressing as she hated the box/car/vet) was only extending her life for a short period rather than curing her. We opted to let her go rather than see her deteriorate and suffer and had her PTS just over a week later. It was absolutely heartbreaking and I am actually crying typing this!

We had to really push to get further tests, and tbh both our vet and the specialist place we were referred to for a CT scan were really shocked that this was the outcome. Even on the day we took her to the specialist centre the vet there was talking about it being likely IBD or similar. Right up to her last day she was running around like a mad thing and wolfing down her food.

(The process of getting the diagnosis was very expensive - I think it was over £3K and then the euthanasia, private cremation, "urn" thing to bring her home in. Our insurance were excellent and even offered to reimburse the previous multiple vet visits over about six months for the vomiting.)

Really sorry to hear that @Judystilldreamsofhorses. Your cat was still young 😔.
Vet has asked for another urine sample which I really don't think will get us any further forward. Will ask to be referred for a scan.

Our 9yr old cat had similar symptoms, weight dropped drastically 5kg to 4kg in just a few weeks, watery diarrhoea and vomiting but nothing abnormal showed on blood or poop tests except a bit dehydrated and some vague inflammation.

An ultrasound scan showed thickened / swollen intestines which they said could be lymphoma or inflammation and that the only way to tell the difference would be a biopsy but that was expensive and risky as it may not heal well due to all the inflammation.

We wouldn't have put him through chemo anyway and as the treatment for both inflammatory bowel disease and managing lymphoma symptoms short term would have been steroids we opted to try steroids before talking about PTS.

He improved massively with steroids. We think it's probably some kind of immune condition or IBD as he's has a few flare ups in the last 2 years. Each time (so far) steroids have turned him around and he's off steroids in between flare ups, for months at a time. We know what to look out for now and get him in at the first signs of a proper flare up. Vet says that it almost certainly isn't lymphoma as that usually progresses very quickly and would have these long periods of remission.

Do ask about an ultra sound, about the possibility of lymphoma and if they think it's worth trying a steroid injection or tablets.

She was so young and so beautiful - it was just hideous. We have a lovely little orange boy now who’s a total poppet, but I miss her every day still. Hopefully your cat has nothing like this.

Unlike @AltitudeCheck the specialist we saw was certain it was lymphoma, and the biopsy confirmed aggressive large cell (there are two kinds, and that’s the worst one). With steroid treatment we were looking at weeks, maybe months, with chemo 12 months max, which was why we made the difficult decision to pts.

@Judystilldreamsofhorses she sounds like a wonderful cat. Glad you habe a lovely new car. Hopefully my cat wound have a serious cause but I really don't think she will get better.
@AltitudeCheck that sounds good that your cat has responded well to thr steroids. Lots of things to discuss with the vet.