I am already bed ridden and in these severe winters where I cannot tolerate -1 C which is not that much compared to you I have struggle taking a shower/bath or even walking also have issues with over eating oh I hate these winters no sunlight as well.
I wasn't going to shovel but I did.i wore a t-shirt, hoodie, wind breaker and my winter coat. With the wind it felt like -15 according to my phone. Was much worse earlier today.
I'd just be in a sweatshirt if it was -1 C, hehe
Try to take care of yourself. I don't mean tell you what to do but work on a good diet.
Regarding diet in the winters I consume two things more:
I drink too much coffee myself but if I were you I would consider drinking tea. If you can eat baked fish instead of fried. You would be surprised eating healthier can make you healthier
For baked fish I would have to put in oven my self but I do not know how to do it and that is why there is a shop near our home with a huge pan of oil so I tell that guy to fry fish for me.
I don't like the effect of tea as it has lower amount of caffeine also tea work only when it is really hot but my coffee I can take while it is mildly hot and not fully hot thats one of the reason I prefer coffee however it is quite expensive.