Am sorry the appointment wasn't very productive, at least you have xrays you can get sent to the other vet. I think pigs do tend to have gas showing on xray most of the time it just depends where it is and how much. As for massage I have usually been told that the only reason not to do it is if a blockage is suspected, but I am not an expert. When my Millie is gassy I give her plenty of fluids (usually Dioralyte), stick her on the massage pad and give her Woodwards gripe water every few hours. Does she seem in pain at all? Also gas can be the result of a pig's digestion being upset due to them not eating from another issue and so getting to the bottom of what is causing what can be difficult if that makes sense. Some vets will also give gut stimulants like Zantac for gas, but I tend to favour the less is more approach. I would definitely call the exotic vet and see what they think. Do you know what the other medication your own vet is switching to is?