My girl (11+) had an abscess in her cheek two weeks ago, followed by having three teeth out. She recovered well and regained her appetite and ate lots of her favourite roast chicken and tuna. In the past week though she has started sicking up small amounts of bile, has gone off her food and become constipated. She makes lots of trips to the litter tray and strains, but only manages a spot of liquid poo.
DH took her to the vet yesterday who could feel from her stomach that she is constipated so presumably there is a lot of hard poo in there. They gave her a suppository and put her down to see if she would poo but she didn't so the vet stuck her finger up her bum to try and break it up. DH says kitty was drooling when the vet did this, presumably not with pleasure 
She was sent away with liquid lactulose for us to administer (orally thankfully!) and the vet said if she didn't poo she would have to come back the next day for an enema.
She did a couple of little lumps of semi liquid poo last night but nothing else. We've given her lactulose this morning, but on googling it looks like it takes a day or to to work?
I'm not looking forward to her having an enema, poor girl. I have looked on google and it seems they sedate cats for it? Does anyone have any experience please?