I have two midget whites. They have been acting strange the past two days and I thought it was because it just got cold out. I've been watching the one all day and I have concluded it is blackhead. I called the vet and by the time she called back it was dead. The other is still walking around but it also has yellow poo and hasn't eaten today. The vet said there is nothing I can do. There's got to be something. I searched online and it said there was an antibiotic but of course it needs a vet. Is there anything over the counter I can use??