Ive been "b"swimming in an indoor pool for 3 years now. Pervious to this time I quit smoking, about 10 cigs,/week. This year has been a bad year for asthma & I take an over the counter antihistomene+inhailer. My concern is heart problems that is causing the problem with breathing while I swim. Im going to guess its alergies because my heart rate is 60 or less & blood pressure is typically 120/70. sometimes lower then that.
Hi, it appears that you have a resistant infection, and which led to the asthma, as it is a late origin dyspnea. Or it may be due to the allergen recently you are in use after that you had dyspnea.  Pulse and dyspnea doesn't suggest any diagnosis. I advise you to consult a physician for diagnosis and treatment. Thank you.