Cat refuses to eat, Vet can't find anything wrong

[Nicehooves]

My one year old kitty has slowly gone off his food over the last month. Vets initially diagnosed an unexplained fever and treated him with painkillers which seemed to work and he started eating again but slowly this has dropped off and now he will only eat small amounts of wet food that I hand feed him. He's still drinking lots of water.
All his blood test are clear and the fever has lifted but now he's got intermittent vomiting and diarrhoea. He's just not his usual self and is becoming lethargic.
I don't know what to do and wondered if anyone had had a similar experience with their dcat?

What are you feeding him?

Hi Fluffy,
I'm trying everything I can think of:

Science plan dry & wet
Lily's dry & wet
Encore fish
High life chicken pate
Whiskas kitten food in jelly.
Plain chicken

The only thing he will consistently eat is the Whiskas and only if I hand feed / bring the bowl to him and even then he just eats the jelly from 1/4 of a pouch.

I've watched him walk up to his bowl (in its usual place), sniff it and walk away... even if there's Whiskas in it. Vet is telling me he's just fussy but something doesn't feel right.

Do you think it's the cereals? It cause d&v in ours but he's ok on wet food with no cereals.

Have you tried gourmet pouches? Not the tins because they have cereals.

Thanks Fluffy, I believe the encore pouches are gourmet with no cereals. He just doesn't seem that interested.

I don't think encore is the same as gourmet, I've fed both & found mine won't eat the posh stuff that's good for him. 2 tins of amionda carney went to the rescue centre after he refused them.

If the vet doesn't know the cause they should refer to a specialist, they can't just leave him like this.

Ahh sorry I misunderstood! I'll try some gourmet today. Annoyingly the last time I took him to the vet he ate 2 or 3 pieces of kibble and the vet decided there was no problem even though he was still loosing weight.
Fingers crossed someone out there has had a similar experience and can give some advice because every time I take him to the vet it costs me £40 and he's no better off.