Has anyone taking there older cat to the vet for a enema...my 10 year old is scheduled for one tommorrow and I'm worried sick. He hasn't had a decent bowel movement since Saturday and now he seems nauseous(licking his lips a lot) and not eating...is it safe and is it more stressful then it's worth...please help ...b.t.w. He went to vet on Monday and was prescribed lactulose hasn't worked and they took blodd which came back with good results...