This morning we discovered maggots in my guinea pigs anus and by the afternoon took him to the vet after realising what it was. The vet said we had cleaned well and there were no further signs of an infestation and have him 3 injections of painkillers and antibiotics I believe. Since coming home he had been rather drowsy but seems to be wheezing/ snoring slightly too. I really don't know what going on and I'm so worried and upset. Please help!