After researching guinea pigs arching their back in pain I'm absolutely terrified it could be a bladder stone.
This time last month Milan had blood in his wee and had xray that showed no stones so was given antibiotics. After the vet appointment I never saw any blood again or heard any crying in pain but continued the antibiotics anyway. I thought it may have been a bladder stone that he had passed himself but not sure.
So I'm wondering that if Milan had an xray a month ago that showed no stones, can one have formed so soon? I'm so so worried about him- just phoned the vet again and by the time I get there it will be closed so I asked about making an emergency appointment and the receptionist said molly the vet won't be there but he can see the nurse

no offence to nurses but I need to see someone who can diagnose my boy. Any ideas on what to do? Hes currently snacking on some hay but his appetite does not seem as normal and he does seen in pain arching his back