Hi Vicki,
I'm sorry to hear about Nikko's Dx but the good news is that there are many, many things you can do to help a CKD kitty. The go-to site on the web for all things feline CKD is the well-researched and well-respected Tanya's Site. There is a veritable mountain of information there to get through but it's an absolute goldmine of a resource for CKD and all manner of related cat health issues.
Nausea and inappetence are very common issues with CKD cats so to kick you off on Tanya's Site here are two links to pages which will hopefully be very helpful to you straight away:
Nausea, Vomiting and Stomach Acid - guide to symptoms and treatments
Slippery Elm Bark Information
Persuading Your Cat to Eat
It's important to watch for signs of nausea because you need to address that alongside appetite stimulation.
As mentioned on the Nausea page there are two meds commonly used for appetite stimulation in cats: cyproheptadine (an antihistamine) and mirtazapine (an antidepressant). The former is gentler in action but too high a dose can cause drowsiness and low mood. The latter doesn't need to be dosed as often but it can leave a cat absolutely crazed with hunger for a while after administration (humans too - I can vouch for that). Mirtazapine can induce
serotonin syndrome (potentially life-threatening so be aware of symptoms - antidote is cyproheptadine).
Cerenia and ondansetron are both used to treat nausea in cats. Cerenia may kick in a bit faster and may be of more help when vomiting is an issue but FWIW in Saoirse's case I've found that ondansetron to have far superior anti-nausea effect (takes about 3 doses to kick in properly for her). Cerenia benefits don't seem to be as long-lasting as ondansetron's for her.
There is a support group associated with Tanya's Site. The link is in the left-hand column on the home page. There are some very kind, knowledgeable and friendly people in the group. They find it helpful if you can get hold of Nikki's labwork and upload it for review (details on the support group site).
One of the simplest and quickest things you can do to try to help with a queasy tum day-to-day is to raise Nikki's food and water bowls.
There's also a Yahoo CRF support group:
https://groups.yahoo.com/neo/groups/Feline-CRF-Support/info
For all things feline constipation:
www.felineconstipation.org
There's also info on constipation at Tanya's Site.
Hope some of the above helps to give you a kick start on the learning curve.ya's
Mogs
.