I Had Bronchitis A Few Weeks Ago But I've Had

I had bronchitis a few weeks ago but I've had shortness of breath every since I had my stints put in in March in my heart I can walk to the mailbox and the time I get back I have to sit down and rest I can make the bed I have to sit down I was never like this before I had surgery and everything I went back to my heart doctor in June for check up and he said my tracklist rooms and my cholesterol was elevated a little but I don't know what else it could be could you help me please