Arnica after surgery

My homoeopath suggested talking 5 30ch pills after doing my heart surgery last week on Thursday, in order to help healing. The problem was myxoma and I am 38 years old and generally healthly. Also, the last 9 years physically active. (moderate cycling the others sports). My usual prescription is calcarea carbonica due to allergic rhinitis.
Friday afternoon I decided to follow the prescription but I did the silly action to get an addition dose of 200 ch the first time. Later at night I took a second 30 ch.
I cant tell exactly when (at afternoon or later on) but I had an heart arrhythmia, something which is common, it happens at about 40% of the people who have to do such a surgery.
However, the surgeon, judging from my excellent condition and my low heart rate (~65-75) was not providing me with any medication for this. He believed that I was going to fall to the 60% category. Until then I was being given only taking antibiotics and salospyr.

Saturday morning, when my arrhythmia (I don't remember the type exactly but I had very high beat rate, more than 120, being calm, withouth this being disturbing) the usual procedure was followed. Which means
Amiodarone, 10 ml per hour, and my condition was soon controlled.
Having read so much negative comments about the non homeopathic amiodarone on the internet (for example 'Arnica may reduce the effects of high blood pressure medications and increase the risk of bleeding in people who take blood-thinning medications. People taking medicines that affect the heart's rhythm or function may have worse effects if they take arnica as well.' source:clevelandclinic) I wonder if the homoeopathic arnica could cause my arrhythmia.

I apologise for this very long and first post of mine and I hoping for your comments.