My kitten has diarrhea for 3 weeks now. First couple of days i let him be, maybe it resolved on its own but it didnt. So i went to the vet and they gave him some vitamin injection + other injection for diarrhea, they didnt tell me exactly what it was and probiotics to give him with a syringe. After those 3 days his diarrhea went away. That didnt last long because after 1 day of not having diarrhea it returned plus his appetite was very very low, he ate only tiny amounts. Today i went to a new vet, a more professional looking one with a more modern office, equipment etc... They did a giardia test, whatever that means and it came out negative. So they gave him a antibiotic injection and they told me what the injection was, a mix of amoxicillin and colistin. And they advised me to cut out his wet food and only feed him dry for now and to change his water bowl multiple times a day. Is the injection he got actually to treat diarrhea? Did anyone go trough something similar? Im supposed to go back to the vets office in 2 days but i just need some information and advice. Thanks!