It is usually reversible but do get an EKG and Echocardiography done. Both Bartonella and Borrelia can cause cardiac problems. If it's Borrelia it is called a 'heart block' and most of the time fully reversible with treatment. Bartonella can cause irreversible valve damage but more usually only in immunocompromised patients.
Consider taking CoQ10 (more than 100mg/day) and Magnesium, they will help your heart muscle function properly and will diminish chances you get a heart attack.
The Lyme bacterium can infect all parts of the heart, including the conduction system around the atrioventricular node, the outer or inner membranes of the heart, the cardiac muscle, and more rarely, cardiac blood vessels or heart valves.3,4 Tissue damage results primarily from inflammation that occurs as the host immune cells respond to bacteria that enter the tissue. The predominant cardiac manifestation is partial heart block caused by impairment of the electric signal that controls contraction of the upper and lower chambers of the heart. Heart block usually is mild, with complete resolution within 6 weeks after onset.
The most common symptoms are light-headedness, fainting, shortness of breath, palpitations, and/or chest pain. Heart block occasionally is complete and permanent, requiring insertion of a pacemaker. Myocarditis or pericarditis may occur. Death has been reported in a few cases. "circ.ahajournals.org/content/127/7/e451.full