Sofia, I'm glad the video therapy is a start. I want to add something from a different angle, because this thread helped me in the spring before I had an account here.
My first winter in Uppsala was the hardest period of my adult life, and for a long time I didn't recognise it as anything more than tiredness. I came alone, the days were very short, and my work is the kind you can do at any hour, so the days lost their shape. I stopped going to the lab social things because I was too tired, which made me more alone, which made me more tired.
What helped, slowly:
- telling my supervisor honestly that I was struggling. She pointed me to the university's staff health service, which I didn't know existed
- talking to a professional every two weeks for a few months, in English, which was fine
- fixed times for everything: lab, lunch with the same two colleagues, a walk at midday while there was light
It isn't solved forever, but I know the warning signs now. If anyone reading this recognises the tired-and-alone loop, please tell someone early, and let them help you find proper support.