Hello, my 5-year-old kitty with stage 1 CKD has been constipated for 1.5 weeks. He’s on Weruva Wx chicken (wet food) with 5 small meals daily, 10-14oz of water, and freeze-dried treats. He gets Catlax, Vet’s Best Hairball Relief, omega-3 oil, and sometimes a probiotic. After vomiting, I took him to the emergency vet, where X-rays showed a lot of backed-up stool. They gave him an enema and stool softener last Friday, but he’s only pooped once since then. His regular vet can’t see him for 2 more days, and I’m worried since he’s still not pooping. 
How can I help him? Could his diet be contributing?