Hi, I have a 1 and a half year old male rat, he has been acting off this past week, while his cage mate is absolutely normal. He has a slight head tilt, cant climb in his cage when before he was very agile and was always climbing around, he just lies at the bottom of the cage, and walks around in circles, he is eating and drinking, but when I gave him his usual treat last night he couldnt hold it in his front paws. He eats with his head flat on the floor, I took him to the vet and he said it was an inner ear infection, and gave me antibiotics, they havent worked at all I think it could be a piputiry tumour, and financially at the moment I have no money to take him back to the vet, as my hours have been cut in work and I have bills to pay etc, I will go back as soon as its payday, I feel awful on my little boy but I dont know what to do....