It takes quite a bit to make me angry, but that would definitely do it. I would feel so angry because I would feel that my trust had been betrayed. I'm sorry, but who the h*ll does something like that. That is something that should be so private between a couple, something that I would think a wife would want to keep quiet just to "protect" (for lack of a better word) her husband's feelings. I'm sorry, but I'm just in shock. And I would respond probably with outright anger first with my voice raised too much, then I'd try to calm down and ask her why she thought she needed to do that. Did she not realize how it would affect your feelings? Then I'd probably find myself pulling back just a little because I'd have a problem of trust. I mean it could be built back up, but it would take some talking and time.
Did you discussed the matter with your wife? Did you even try to get help from a doctor even if to proof your wife wrong? Did you even took your wife's feelings into account? Why did she had to go outside the marriage to seek advice?... yes if there was proper communication between the two of you it should have been kept private... but considering all other aspects she had the right to confide with close family and friend.