I would say not an emergency vet - but a DIFFERENT vet.

When I first got my kitty Cole, he had the same thing, and just a touch of diarrhea.

I took some of his stool into the vet to get checked. The tests showed such s SMALL increase in a certain bacteria that they wouldn't treat it - unless he was showing symptoms.

He was - so a pill a day for five days, and he has been just fine ever since!

I'd put some of your kitty's poop in a baggie, take it to the vet's, and tell the technician you want it tested.

Stupid Vet! It's BLOOD!

Go for it.