Typical monkey noises. I hear this when my gals are sick or myco is flaring up. Also I’ve heard something similar with early pneumonia. I replied before but it hasn’t been approved yet. I use the same meds as you. I follow deb the rat lady’s recommendations. If you google her name her site should come up or the rat fan club. It has a ton of info on meds, dosing and respiratory illness. I actually ordered her book because her advice has never failed me. My gal didn’t improve on doxy and enro so I tried amoxicillin and it worked beautifully. I got my vet to prescribe it. Best of luck to you and Roxi!