Maddykins
Junior Guinea Pig
I have two boars, both about 4 years old. One of them had diarrhoea yesterday and was not eating or drinking for at least a good few hours and the diarrhoea was getting worse rather than better. We phoned the emergency vets and they advised we take him in - this was around 11.30am last night. My partner took him there and had to wait a couple of hours to be seen, vet said they didn't know what was wrong with him and mentioned that he was "quite old" (since when is 4 old for a guinea pig? is it?). Vet felt his tummy and said there was nothing in it at all
and kept him there overnight, said they would syringe feed him nutrient-rich food and keep an eye on him. We called them this afternoon and was told that he still has diarrhoea (unclear yet whether any better or not) and that the vet says he can come home but he will need to be syringe fed every 3 hours or so round-the-clock. My partner has gone to collect him and has a discharge appt with the vet in a few minutes.
I am worried he hasn't received the best piggy-savvy care as it didn't sound like they were going to actually investigate what is wrong with him? We are able to syringe feed him - well, I'm not as I'm very ill at the moment with a chronic condition but my partner will do it. But I hate to think he is just being sent home to us to feed him and that there could be something wrong that isn't being treated? I feel like he is too young to die yet
He has had diarrhoea once before a few years ago but that lasted less than 24 hours and he was still eating hay throughout that time and then it cleared up itself and he went back to eating his pellets again the next day too, so it's worse this time. He hasn't eaten anything different/unusual, and his brother is fine and does not have diarrhoea. They are indoor pets if that makes any difference.
Any advice/suggestions appreciated.
Also it has come to dawn on me that I really take their health for granted and am not prepared for them to be sick so I want to set up a mini first-aid set. I have looked on the PDSA shop and they have syringes for feeding, and a few different special feeds: Supreme Science Recovery, Supreme Science Recovery Plus, and Oxbow Critical Care. Any advice as to which is best? And what else should I have ready in a first-aid kit for the pigs?

I am worried he hasn't received the best piggy-savvy care as it didn't sound like they were going to actually investigate what is wrong with him? We are able to syringe feed him - well, I'm not as I'm very ill at the moment with a chronic condition but my partner will do it. But I hate to think he is just being sent home to us to feed him and that there could be something wrong that isn't being treated? I feel like he is too young to die yet

Any advice/suggestions appreciated.
Also it has come to dawn on me that I really take their health for granted and am not prepared for them to be sick so I want to set up a mini first-aid set. I have looked on the PDSA shop and they have syringes for feeding, and a few different special feeds: Supreme Science Recovery, Supreme Science Recovery Plus, and Oxbow Critical Care. Any advice as to which is best? And what else should I have ready in a first-aid kit for the pigs?