Is there a way to treat heart arrhythmias and prevent heart failure?

Yes: There are many effective ways to treat heart arrhythmias and prevent consequences such as heart failure. The most common way is with medications such as beta blockers or other anti-arrhythmic medications. There are also procedures, called ablations, which treat the arrhythmia by interupting the electrical signals of the arrhythmia. A qualified cardiologist should be able to help.

Yes: You need to discuss with the doc. As to what arythmia it is first atrial fib /flutter or ventricular arythmias.