I have an appointment for my 10year old cat for a enema and I'm very worried that it's gonna strees him out to much.he hast had a proper bowel movement since Saturday he had a small one Sunday and this morning. brought him to the vet Monday and he was prescribed lactulose and it really hasn't worked...and now he has stopped eating so I'm very worried...when I try to feed him he licks his lips like he is very nauseous...he had blood taken when he was at the vet and was told everything looked good....is it normal for cats that are constipated to be nauseous and not want to eat? Will the enema help him with that? Im just worried about the whole thing..just want him to feel comfortable and normal again....it happened so fast he was fine Friday afternoon and then he went downhill from there....any advice would be great