This is concerning and like the others have suggested I would also watch and see. Its possible for whatever reason he was having an off day. Perhaps this is the time to get a second opinion to review everything? I don't think that is ever a bad idea especially if you have been treated by the same doc for a while. It doesn't mean you leave your main doc just that you are getting a second set of eyes, a fresh set, on your case.

In all fairness I try to take the time to glance over my patients chart before I see them to refresh my memory but there are times when that isn't possible and I have said some off the wall things also.

Its hard to remember everyone's particulars and sometimes I will have two patients of similar demographics, similar presentations and I have difficulty keeping straight the particulars if I don't read the chart first. I'm fairly sharp still, knock wood, so I largely put this off as trying to multi-task at the speed of light while seeing 16+ patients a day. Good luck!