If you have had positive Cardiac and Pulmonary Work-ups, have had blood work to preclude anemia, thyroid problems, and the like, be sure the blood
are as expected (anemia could denote internal bleeding, too many white blood
cells could denote an infection, etc.), you seem to be in good shape physically. Do you have any occupational exposures to chemicals?
A person can lead a normal life with a Pacemaker, why not.