Do you mean 8 weeks continually in AF? No previous history? If this is the case, then I would say a cardioversion might just work. But you should also be on a DOAC, for certain, and you might also benefit from metoprolol or diltiazem to keep the rate in check. Does you your ate vary? Is it much higher than 100 for any length of time, say 24 hrs or longer? If so, then you are an acute case and should probably be under doctor's care, maybe even go to emerg?