Pneumonia & stasis nearly lost Evan

My boy bun that i rescued in february has had three episodes of acute respiratory distress, now each time this happens the vet tells me his lungs become more damaged the culture swab from his nose came back positive for pasturella which in itself isnt conclusive although the x-ray did show what the vet think is abcesses and a consolidated lung lob this morning when they x-rayed him this am
At the minute after a dash to emergency vets he is on baytril, frusemide and GI stimulants as refusing to eat or move he's at home with me as a hospital environment makes him worse also he has lumps and bumps appearing so there is a possibility he has nodular Myxo. The vet has taken a blood sample to test his antibody levels to check if he mounted an appropriate immune response to the vaccine. As myxo can affect the lungs also.
How can I prevent this cycle continuing he only ever seems to be well for few weeks then he starts brewing a episode I keep the hutch spotless as amonia can exacerbate things, he has 3 weeks antibiotics at a time (should i consider longer course?)

Any advice appreciated have to sick buns at the minute and i am worried that Evan will have an acute episode where i cant get him to the vet in time

Oh dear he does sound to be very sick

It is likely that the gut stasis is secondary to the Pasteurellosis. It may be that all you can do is treat symptomatically as in advanced cases of Pasteurellosis a cure may not be possible

I hope he can defy the odds and pull through xx