So since October 1st there’s been a rollercoaster of my guineapig Mickey continuously getting upper respiratory infection, I take her to a vet and they give her baytril for a week, after that it seized but then noises came back and I got worried so once again we went to a vet and they gave us baytril for two weeks ! Once again she got sick after a week or two being off but finally we went to the third vet and they had given us antibiotics, probiotics, and this fluid to put inside a nebulizer so she can inhale it and after those two weeks she was perfect for the longest period of a month, but of course once again she’s having the breathing issues and mucus again... I’m not sure what to do anymore am I supposed to accept that the bacteria isn’t going to fade and to let her go ? I need help 
