I am an RN and my mother keeps getting respiratory infections with high fevers and SOB. They keep treating her with Doxycycline and I am afraid her immune system is compromised. I also worry about super bugs. I have suggested that she see a pulmonologist, she also was hospitalized with Influenza A this spring as she was struggling to breathe. She has hx of asthma, hypothyroid, hypertension, obesity, borderline diabetic, BLE edema frequently. What is your suggestion to this problem? She again just yesterday came down with a severs respiratory infection overnight with a sinus infection and AGAIN is on Doxycycline. I am getting frustrated because they are not coming down to the bottom of the problem. Some type of fungal problem? CHF? Help?