I had taken Toprolol when much younger
and in normal sinus rhythm (then it too was 50mg SR)
and it had no side effects that I can recall, I was still running for exercise.
You might want to discuss using a calcium channel blocker to lower blood pressure.
In all my comments are made with no knowledge of "diovan" and its side-effects.
Good luck in finding a way to keep the BP normal, that is an important issue.