The electrical system of the heart starts at the Sinus
Atrial or SA node where the signal for the heart to beat originates. The signal then travels through the atrium to the atrio-ventricular node (the AV node) and then moves down into the ventricles into the bundle of his which shortly there after divides into two "wires", the left and right purkinje fibers.
In a bundle branch block
, there is a delay in the electrical signal traveling through these purkinje fibers. A delay of the right system results in a right bundle branch block and a delay in the left results in a left bundle branch block.
A RBBB may be associated with underlying heart problems,however, it is also a fairly common in normal, healthy hearts.
But since you are a diabetic patient and having symptoms,you must be properly evaluated by a cardiologist and treated if any anomaly detected.