I have two 3 year old female British short hair cats, sisters from the same litter and both have been neutered. Little black one called Haku and a white and black one named Kiki. They have always been close, napping together, bathing each other, playing together etc. Just after some advice or reassurance really. There was an incident where Haku knocked a box off the shelf just as her sister Kiki came around the corner, Kiki absolutely hates loud noises, so this terrified her. Haku jumped down at the same time, so landed straight infront of Kiki, she then started hissing, growling, yowling and fled. We thought she was in pain so took both cats to the vet, but got the all clear. Poor thing was not happy to go to the vet, looking back this probably exacerbated her fears. It's been 32 days (I'm keeping a journal) and Kiki still can't really tolerate her sister. I'm so desperate, they're my world, they've helped me cope with the grief of losing two very close family relatives and I'm terrified, I do not want to re-home my cats. This is where we are at: They are separated at all times. However, both cats are extremely clingy (especially Kiki) and this stresses them out A LOT. They have ripped the carpets, ruined the doors and meow extremely loud at night constantly. We have tried Feliway diffusers but nothing seems to help. Unsure if this is also contributing to Kiki's issues. Kiki no longer hisses at the scent of Haku on a clean sock or towel. We feed them 3x a day together, pretty much nose to nose. However, on the odd occasion Kiki will hiss and walk away. We move the bowls further apart next time and build up the comfort again and repeat. We use a screen and let them see each other on opposite sides, they are not 100% comfortable with this. Kiki tried to groom Haku once, they groomed each other for a few seconds. I wasn't quick enough to distract Kiki and after a little while she hissed. I keep kicking myself for not rewarding her for the grooming. Am I doing the right thing? Has anyone experienced this before? It seems Kiki is just uncomfortable seeing Haku and being too close to her. They both seem extremely distressed being shut away, but they can't be together. I'm at a loss and feeling rather hopeless. Thank you for taking the time to read this.