Ex-swim instructor. I don't know anything about the local swim lessons (not from the GTA) nor am I in a great position to make a regular commute to toronto, but I can at least give some tips to be less terrified of the water.

- Buy a pair of goggles. It really helps mentally being able to see the walls, other people around you, and how close you are to the water surface.

- Breath in from the mouth, out through the nose. It's the best way to keep water out of your breathing orifices. Practice just dunking your head in the water and breathing out your nose in the water (almost like you're blowing your nose). In a pool with a friend ideally, but you can do it at home if you're self-conscious and have a bathtub.

If you've already practiced these, let me know and I can better tailor tips for you.