Stubborness, as you’ve found, can be a good thing. You took advantage of an opportunity to find out what you’re made of and you did it. You found work, managed to live in another culture, and survived a serious illness without the support of family and good friends. I would say that the experience has been an enormous success. You now know without a doubt that you can take care of yourself by yourself if you have to.
But, here’s the thing: You don’t have to. It’s good to know that you can but you don’t have to keep doing it to again prove it to yourself or anyone else. As far as I’m concerned, there’s no shame in deciding that you’ve learned enough for now from the school of life and that it’s time to do something a little easier.
The disturbance of sleep and eating patterns might be your unconscious prodding you to get up and go. If there is really nothing to keep you in Finland, perhaps it really is time to return to your own country, at least for an extended visit. Bring all your newfound confidence and maturity home and see what’s there for you now. You will then have more basis for deciding which country is a better fit for you at this stage of your life.
I wish you well.