[juliancox]

Exercise! It's been repeatedly shown to be a huge contributor to mental health (as well as physical). Take a walk in a park, ride a bike, go jogging or have a swim. All are cheap to do. Start slow if you're not fit, but make time for it every day (at least half an hour). It's more important than almost anything else you might want to do more. And definitely get help for your suicidal thoughts.