Is it possible Perkins is nauseous ?
If so ondansetron is very effective, it is important to not give a appetite stimulate if the kitty has nausea.
I do think Zyrtec also stimulates appy... I am tagging
@tiffmaxee as her Max I think ate well when on it.
Licking his lips is one of the most common signs of nausea especially when they sniff food-as well as drinking more water.
If your vet will give you a script you can get ondansetron online it is usually 97 cents for 8 mg
Most average cats (10ish pounds ) get 2-3 mg so just cut it up doesn't have to be exact and putting in a gel cap is a good way to pill a cat so no yucky taste and with a dab of butter or vaseline or baby food etc.... it slides right down.
Dry pilling can be dangerous and get stuck-
Cerenia is much less expensive online as well and doses vary--My Rico gets about 15 mg of cerenia 1X a day (we get a 60 mg and cut into 4 doses) and he also gets ondansetron 3mg he is about 13-14 pounds.
I know vets can be jerks but maybe if you tell them you are limited on funds and would greatly appreciate a script to purchase online they might accommodate?
Easier to catch flies with honey

Have you tried gerbers baby food? the 2 stage all meat usually is tempting for a kitty --the vet may also suggest a few cans of AD which is easy to syringe if you need to assist feed.
