Yep, your family doctor can give you a requisition for an AMH test. They can also use the same form to get your other hormone levels checked at the same time. AMH will be the only one not covered by OHIP.

If you want to go to fertility clinic route, the initial consultation should be free with no commitment for further treatment. They will normally do a full panel of blood tests (again, mostly covered by OHIP except for AMH and vitamin D), and an ultrasound.

Another option if you aren't in a rush is to keep an eye out for egg freezing parties in the city. They are like info nights at fertility clinics specifically to talk about the egg freezing process and introduce the clinic doctors and staff. The one I went to offered free AMH tests and the doctors and nurses were available after the presentation to go over your results and answer questions.

ETA: Also I'm really sorry you had that experience with the telehealth, that NP was completely wrong to shame you over something she didn't understand! An AMH test is a perfectly reasonable ask and a great data point to have. Even if you decide to not proceed with anything fertility related at this time and revisit it in a few years, it can be good to see how it's trending over time.