I am sad to hear that Sterling is still having troubles. I hope that the vet can sort something out to make it go away. I am having a little headache introducing and managing the problems that having two babies can cause - I can't imagine what you go through having 14 plus the fosters. I can guess that sometimes these type of things will happen - it's not your fault, Jen, sometimes cats get a bee in their bonnet. When Mum first introduced Whisky and Milo to her boyfriend's cats these sorts of things happened but it settled down again. Maybe all it needs is lots of cuddles and even more time.