Mitzvah gedolah l’hiyos b’simchah tamid. Even if you are not in a happy mode right now (so sorry about that for your sake), perhaps if you try to feel better for the sake of it being a mitzvah to do so, you make come to feel better for real. This (sad matzav), too, shall pass.
Sometimes the best thing you can do is ride out the storm, and sometimes it is better to occupy yourself with worthwhile things (doing chessed, going on enjoyable outings, sitting by some beautiful aspect of nature, and contemplating the positive things in lfie that Hashem has given us). No one is immune to pain. How we react to and deal with it, is what defines us. Hatzlacha rabbah.