help with diet for cat please

saidan

hi all

i have a cat who has some kind of skin allergy - basically licks a lot,vomits a lot etc

we have been going back and fore to vet for a few years, she suspects flea and flea treatment sensitivities, on top of ?IBS

she usually has a steroid jab, then it clears up a little then gets worse.....we have tried various prescription dried food which made no difference.........she also wears a cone most of the time which of course stops the licking but she is miserable because i then keep her inside....

so i have from today to feed her fish only for a few days to settle tummy,then add in steroid tabes instead of the usual jab.....but i need to explore foods for her after this.

the vet advised against raw food as i have an infant in the house

i am happy to cook fish daily for her - but what else will she need to compliment her diet? it will also be trial and error with her tummy.....

i've googled and can't google anymore

i also have another cat who is fine (but fat) , and so will need to now feed seperately.

any help out there please?