I Have Bronchiectasis And Mild COPD I Have Used With

I have bronchiectasis and mild COPD I have used with accompaniment of prednisone and Levaquin, Keflex , Avelox, Z pack very frequently. I am in FL at my second place with a new pulmonary dr. I have 90% oxygen but starting to feel better I usually have 98% when normal. He prescribed DOXYCYCLINE HYCLATE 2x a day.
I might need a new drug as I have been on these too much. At least 4x a year when I get bronchitis. what do you think of this drug for my medical history. I have AFib but don't feel it and am on Xarelta