Digoxin can be added, since it minimizes my symptoms.

My cardiologist informed me that digoxin is usually added on top of maximally tolerated beta-blocker therapy.

Since, I am taking a small dose of beta-blocker, I should first try to raise my beta-blocker dosage instead, provided I am in otherwise

good condition. 

I have to book an appointment with my cardiologist accordingly.

This is a wrong response that could lead to potentially harmful results to the health.