About the pantethine, don't take it at night. Seriously, I said that for a reason. Try to follow my suggestion for how to increase your dose. It sounds like your body was starting to get used to it until you took it at night. With AF it's important to follow a schedule. Slow and steady.
Try to start over like I suggested and don't take any after 6pm at the latest, preferably let your last dose be around 4pm.