Amiodarone
"Good after cardio-version. I was prescribed it and my heart went into atrial fibrilation. Side effects I suffered were stomach pains (like carrying a 10 pin bowling ball in your stomach). Couldn't keep anything down, from light snacks to drinks. Severe fatigue, tiredness, diarrhea, dizzy spells. 
After my cardio version for the 3rd time, I feel 100% better, and am still on amiodarone and all the above symptoms have subsided.

The only side effect I have now is: short term memory loss, lack of appetite, get sunburnt very easily."