Sometimes, feelings of unhappiness and depression can really be disturbing. But truth be told that it we who chose to feel certain emotions. If we continue in an unhappy state and do nothing about it. It will stay that way. So, you must learn how to fight back, control your emotions and never ever let emotions control you.
If you want some 'happy' hormones (whenever you feel like you have none left
), bask under the sun, go out with friends, have a long chat with a loved one, exercise,read a happy book, indulge your appetite or travel. There are lots of activities that are guaranteed worthwhile and helpful at obviating negative feelings.