I don't think it's a good idea to stop taking medicine without advice from a doctor. Usually, induced-ED from medications will go away after you stopped taking them. What's important now is to resolve a bigger problem which in this case is your unusual cholesterol level. If your cholesterol level is not controlled, you may face ED too because your blood vessels will be narrowed. So, what's your point of stopping medications if the results are the same in both cases while what differs these two is the time taken for the results to be seen?