Hello, Hitomi san!😊 Like you, I am living abroad. I agree on what you have said. 寂しさをかんじたり、落ち込んだり、籠もったりすればいいのは誰でもあるある。あなたの気持ちは理解してます。I feel the same way too. In order to fight my negative emotion I always tell to myself is, " What you think is what you feel." It means if you think negative that's what you gonna feel. So, if you want to feel the positive vibe you should think positively.