Maybe the first question is whether it's assault. It's assault in Canada, at least, because the doctor was abusing his authority in order to touch you. This removes any possibility of consent.
There may be Canadian case law clarifying this, I don't know, but prima facie it doesn't seem to me that your position is correct.
Note that other legal systems have problems with doing things under false pretenses. A woman claimed rape because her husband's brother slid into bed with her and initiated sex, in which she went along. The guy didn't disclose explicitly that he wasn't the woman's husband. When she found out she felt (justifiably) violated. Yet the guy was acquitted because there was no statute on getting sexual favors under false pretenses (there is now by the way, as a result of this case).
(3) For the purposes of this section, no consent is obtained where the complainant submits or does not resist by reason of
(a) the application of force to the complainant or to a person other than the complainant;
(b) threats or fear of the application of force to the complainant or to a person other than the complainant;
(c) fraud; or
(d) the exercise of authority.
I was referring to part d. Part d would also apply to TSA officials as far as I know, but if they were on Canadian soil they'd probably get some special exemption. Also, I don't believe they technically do the searches on Canadian soil. Airports are weird.
Force means something a bit looser than you probably think it does. A light tap can be considered assault, let alone grabbing and poking.