Hi I have a guinea pig named bubbles. Recently he's lost a lot of weight and there was crusting round his eyes and nose. I took him to the vet and they said it's a nasal infection so I've been syringe feeding him hourly over last night and he put on some weight and it seemed he was getting better. He is going to be having dental surgery on Monday but tonight he started dragging his body and has suddenly gotten week and been a bit pickier with the syringe and has a mucus/yellow/goo coming from his butt. What should I do? He's on antibiotics, painkillers,probiotic and syringed food and some bannana and hay.