My fixed male cat of about 7 years old has had constipation issues off and on. I have 8 cats and 3 others in his area. A few days ago I saw him trying to poop with no luck. Whenever he ate, he threw up. I brought him to the neighborhood vet Saturday and they ran lots of tests. They said he didn’t have megacolon and that they gave him an enema but nothing came out except a hard poop from the end. They also gave some fluids and charged me almost $1,000. Then sent us home. I bought him some Churu and he kept a little down last night. He is refusing all food today and no poop. I did see him pee. I put a tiny amount of Miralax in the Churu yesterday but today refused. Please help.