Poor Lily Cat is stressed to the max and has developed recurrent cystitis 
The cause of her stress is one of my other cats. The other cat is two years old, very confident and boisterous. We got her as a kitten, but she's pretty much taken over
Lily is super bad with her nerves and a real jittery kitty. We have a very quiet house with hardly any visitors, tv or noise, but it's the other cat she's struggling with.
Lily is having treatment for her cystitis, but we need to minimise stress. We're currently trying to keep them separated in the house and have extra cat litter trays. It's not an easy task.
Lily has three days supply of Metacam and a cysto something supplement to take each day. She's only allowed wet food and must have water around the place. She has her own litter tray tucked into a quiet corner.
I've put the lavender essential oil aromatherapy diffuser on.
Anything else I should be doing?
We may have to think about rehoming the other cat if we can't manage to keep them separate. We only have a small house.