The stool problems could well point to IBD even in the general sense ( easily treated btw so I wouldn't worry ) in the absence of an elevated T4 test for hyperthyroidism. B12 is often prescribed as is an antibiotic/anti-inflammatory with this condition. The B12 should definitely help with weight gain and it's often a good idea to supplement it with older cats who are thought to be deficient.

Has she had an increased appetite plus weight loss? In which case this could point more towards hyperthyroidism though some cats are atypical. Some cats do have diarrhea and vomiting while others don't.

Be interested to hear the T4 results!

Forgot to mention-glad to hear about the higher meat content food changes!

Thank you Ianthi. I'm not entirley sure if she has been eating much more, but is desperate for her food to be put down in the morning, wails outside the bedroom if all her food is eaten, so that to me suggests increased appitie. Sometimes it's difficult to tell if she's eaten all the fod herself as I have 2 other cats. She's having diarsanyl twice a day, which she is HATING! But the weather has been nice and she has been outside all day today, which I'm taking a s agood sign as she had been reluctant to go outside for the last while, although I have been a bit worried tht she is also trying to avoid me!
Results back on Tuesday, vet has asked me to bring her back in Tues or Wed to check her and give more anti-biotics. trying to arrange a lift or taxi for that and check tomorrow that it's ok for me to have the time off work.
Made an order from zooplus this morning, mixture of bozita, animond carny adult & senior and grau gourmet- sound ok? I referred to the A-Z guide
Do you know what things are best avoided for IBS, or is it trial and error for the individual cat?

Very good choice of food! Basically what I feed my own cats and they love all three!

Not sure what you were feeding before but if it had grains ( all the newer foods are grainfree apart from the Grau which has rice, though rice is the least likely to produce an allergy ) in it then the symptoms she had could well be a reaction to them. I'd eliminate this one first. Then you need to look to a protein souce like chicken or beef. Did you mention the dripping liquid stood to the vet? However this is only my hunch and only to be considered with a negative T4 test!

Anyway I'd see how she fares on these newer foods though of course with the medication it may be difficult to judge the results properly on this occasion!

I avoid food with low meat % because it seems to give middle cat bad skin - I thought it was the additives, but could be grain. youngest is also allergic/intolerant to chicken! Have been trying to feed only tinned fish, arden grange, fish 4 cats and burns sensitive. However, I realise I haven't been very scientific in my approach though, as arden grange full of rice and maize. Anyway, Sasha gets grumpy with only these foods so I ahve given her whiskas senior fior the past few days, she loves it-too much probably, I think there must be some sort of addictive additive in it as the other 2 go mad to have it when she has it too, so it can get a bit complicated, trying to feed different foods to the 3. I would love if Sasha could enjoy better foods, but she loves the junk! Hopefully she will like these new foods. The vet said to me yesterday that it was best for me to be feeding her senior foods- do you know anything about this? I have searched for threads, but can't find anything.
Roll on Tuesday....she seems so much happier in herself after vet attention and no drippy poo today!

Not sure how much of a marketing gimic 'senior foods' actually are!

The main advantage of senior foods as far as I know is that amonst other things some contain lower phosphorous which will lighten the load on the kidneys. However I have a feeling Grau has a lower phosphorous level than the other two foods. Out of interest I would ask the vet why he suggested it! I'd be interested to hear his response.