Stop watching all other news channels except DD News. Be selfish. Think about yourself and your loved ones only. Stop advertising your feelings and moods on social media. Watch a movie when you are in a bad mood to escape the world. Don't overthink about your past and future. Both are uncontrollable and unchangeable. Stop worrying about corruption, terrorism, global warming, poverty, feminism and everything else which you can't change. Spend as much as of your time as you can with kids. The least you expect, the happier you become. Smile, all the time, even if you are sad. Fake it till you make it. Don't try to find happiness. Learn to be happy anywhere, anytime, anyhow.

Kindly consult a Psychiatrist for a detailed evaluation of your problem.That would help in understanding the causes of and various factors contributing to your distress and then plan the treatment  targeting your specific needs.

If this happens on a regular basis and is occurring for more than 2 years then it could be dysthymia or chronic depression. Detailed evaluation and treatment will help you get better.

Looks like Depressive features

If it is happening for so many years at the frequency you have mentioned it may be that you are suffering from depression. However it can only be confirmed once you formally consult with an expert.