I had a cold before I started taking Macrobid. Started taking it yesterday after two days of high fever and bladder pain and frequency and urination. I have a kidney stone and a stent in place. Today when I cough I become short of breath and can feel my heartbeat for a few minutes. If it s a single cough it s not so bad it is very noticeable if I have a coughing episode. I did not have this before I started taking the medicine. Pulse ox is 96. Should I be concerned?