Discrete ADHD diagnosis in Canada

Hi Folks, I am based out of Toronto Canada and I have symptoms very similar to adhd. I am not able to focus on a thing, I constantly maintain written notes to keep me organized, procrastinate a lot, Extreme anxiety and very sensitive to random sounds.

I voiced this out to my life partner and she gaslit me saying I am overthinking and i might be saying such things to avoid responsibilities ( I don't , I take part and contribute near 50% in household while maintaining a full time job). Whenever I bring this up she is not ready to listen and basically she doesn't want me to express anything about my health,she gets way too upset and she can't handle it.

How can I discretely get diagnosed and get help ? Please advise, the symptoms I have is eating my life and I am struggling to stay afloat with zero moral support from my spouse.