2 weeks ago my guinea pig was sneezing more frequently and there was an instance where milky snot came out of his nose. I took him to the vet and they gave me an antibiotic called septra which I gave to him for a week. On the last few days of the medication, my piggy stopped pooping entirely and he ate and drank very little. I brought him to the vet again and they told me it might be the antibiotics messing up his digestive tract. I was told to feed him critical care, a probiotic and cisapride. My piggy seems to be eating normally now, but it's been 4 days and his poops are still kind of small and one of the ends looks tapered. In addition, he's sneezing occasionally now and there's a bit of clear discharge that comes out of his left nostril. Does anyone have any thoughts about what I should do?