Normally, the cardiologist would prescribe a blood thinner when a patient has been diagnosed with AFIB. Stoke is the major concern due to the normal pooling of the blood.= due to FIB.
The shortness of breath may be related t some type of a lung issue, which I'm sure the pulmonologist is aware of at this point. (I have AFIB).Is your imine system impacted? That would make your lungs more susceptible (along with other parts of your body) to picking up unusual bacteria. I'm surprised that the inhaler impacted your heart, was it prescribed, and revied by your team?
You should be comfortable asking direct questions to your providers, no need to guess.