Hi, and sorry you are ill. Well, norovirus
usually goes away on its own within about a few days. So, it may be bacterial or
even a parasite. If you haven't had a culture done you should have one done. Have you eaten out a lot or at a friends house or family over the holidays? Did anyone else get sick? Your potassium would have to be extremely low (below about 2.7) for it to cause Afib but it is possible.