Okays, sorry for the late reply, I've been having problems with my laptop and my PC had problems with paw-talk, so hopefully I've sorted it and it'll work now on here.
Anyways, thanks you very much for your replies, esp. Luvboyrats info
The vet said Arthur has a bad chest 'infection', so we don't think it's myco, but the vet could be wrong. He got given an injection when we went to the vets, she said it was the strong stuff, so we wouldn't have the trouble of syringing it. We also got a bottle of 2ml baytril 5o/o solution, with added milloph; to open his airways. We also got a repeat prescription, without having to go back in with Arthur, so thats okay, but this time the solution had no added milloph.
He has finished his meds, I think it was early this morning, so he is back on water and I havn't heard a wheeze or rattle from him... yet.
He is a lot more snuggly and cuddly than usual, but definatly happy and not losty any weight.
When he was weighed at the vets before he was on meds, he was the normal, over 500grams or something, but I know he was over 500g.
We havn't given him any wet food (I.E. Yogart) because the vet said i would easily block his airways, however, I have been adding children vitamins to his diet, but I don't know if it's helped... it's certainly helped Pepper though.
Thanks again everyone. Your love and wishes have made my day!! Luv you all xxxxx