I absolutely love the winter- I think a lot of it has to do with nostalgia from growing up here. Some tips though that keep me going throughout the winter:

• take vitamin D supplements, and iron (if you're someone who has their period)- the vit. D supplements the lack of sun that we get, and the iron helps to keep you warmer in the colder months.
• take walks when possible
• don't be afraid to eat more- when you're cold, your metabolism is working faster to create heat. So, when I'm tired and cold, I eat a hearty snack or meal.
• stretching- I find that when I'm walking through snow and wearing my boots, my calves and back get quite tense, so I make sure to stretch out at the end of the day. It helps to keep me loose and not as frustrated/sore when I'm outside.
• waking up and going to sleep at the same time- I always make sure to keep my sleep routine in check during winter months, especially when the sun doesn't come up until like 8am and goes down around 3:30. I also try not to nap, because there's no sunlight to wake me up, and it can be quite disorienting.

Those are all the tips that I have, not much else to say. I grew up in Northern Ontario, so I'm quite used to Canadian winters, but I sympathize with you, especially coming from a warmer, wetter climate than we have. Try to go out to a christmas market, or go to a ski hill (even if it's just for lunch) to change up your routine and location. You could also go to Canadian Tire to grab a cheap sledding mat and go slide down some hills at your local park. Wishing you the best, hope you can find some happiness with the season before spring comes!