Have Some Romance

Sex too helps your brain release those 'feel good' chemicals. If you have a partner, have sex. If you don't have a partner, explore ways to excite yourself sexually. 

Depression, anxiety, mood swings - whatever the name is, the actual problem is in your mind. As long as you think you have a problem, you are not going to come out of it. As long as you think you are going through a bad time or a bad day, you are not going to feel happy about it. The trick here is to forget about shit that already happened, and move on hoping for a better tomorrow!