For those of you who have been following along, I am doing much better. I saw improvement almost immediately after beginning the medication. The palpitations did continue, however.
I was having so many that for a second time the monitoring company told me to stop pressing the button. I called my cardiologist's office for clarification, and the nurse I spoke with was furious with the monitoring company. She said I absolutely should press the button with every palpitation so they could measure how I was responding to the medication.
Within two days, it was a moot point. The palpitations were few and far between. By Wednesday I was only having a handful a day at most. My cardiologist gave me permission to stop wearing the heart monitor, for which I was grateful.
Yesterday we spent 3.5 hours at the park. Something I would not have even been able to consider doing just two weeks ago.
That's the good news. The not-so-good news is that we still don't know the cause of all my issues. And, the longer I am on the medication, the more I am feeling it's side effects. But so far, they are not too unpleasant.
It's better than the alternative. I'll keep on keeping on, and barring any sudden changes, will see my cardiologist again in May.