well, he is an expert and maybe he was honestly concerned. There are people who are seriously overmedicated out there...so maybe that's where his worry came from. would you feel the same if he commented on an anti-biotic you were prescribed, saying it might be a high dose?
however,if you don't feel overmedicated and this combo works for you, don't worry about the comment. If you feel there might be some problem talk to your doc.