For me it's been eating well (avoid processed food), exercising (as you note) including yoga, walking, the gym, dedication to meditation, and the big one, CBT (Cognitive Behavior Therapy), a reconditioning of our thinking. Books and journaling are enough for me. You can read up on it on the web and perhaps look for books in your library.
Of course work is all important so you'll need to explore how to jump start your work life or rediscover the joy in the work you did. The social aspect will resolve itself as you feel better about yourself. It's a grand adventure to take charge of ourself. You've come to a good place, others are likely to join in to support you. Wishing you the very best.
PS. If you go to Amazon and search for CBT there are several books listed. You may find one that appeals to you. The book that did the most for me is the Sam Obitz book, Been There, Done That? Do this, which helped me but not others. Maybe your library has the CBT for Dummies book. They often are a good start. Just some ideas.