You don't say whether the vet is suggesting an acute problem (lily toxicity, etc.) or something milder and more chronic. So, I'll assume the latter. Your vet will have the best advice for you, so ask lots of questions. The management/treatment plan he/she develops will really depend on your...
I'm a veterinarian, currently specializing in behavior. I'm married, with 6 year old twins. Our family has two 17 year old indoor cats (Leia and Yoda) and a semi-neglected outdoor neighborhood cat that adopted us (Sophie). They're mostly great with a small amount of annoying thrown in (kinda...
