Recurring Pneumonia after MAC

My husband was diagnosed with MAC in early 2024. He completed the year long treatment of 3 antibiotics. The day the told him it was clear from MAC he found out he had 2 different bacteria in his lungs including E.coli. Since being treated for MAC and the bacterial infection he has had pneumonia 3-4 times. It seems like every time he gets off of antibiotics a few weeks he ends up sick again. We just don’t feel like we’re getting much help from his pulmonologist or infectious disease doctor. He has been sick for about 5 years before being diagnosed (every time he got off antibiotics for a few months) he got bronchitis or pneumonia again. They found it after he was hospitalized with pneumonia and a Bronchoscopy was done. Can anyone give us advice on how to get someone who will help? Thank you.