Hi there. Depression is a weird disease. It makes you do and think weird things. Have you seen a doctor? They have wonderful treatments and medication that will allow you to feel and function just like the old days. It's hard to put on a "good face" eveyday when inside you are battleing the fight of your life. Happy thought and all that jazz don't work. Medication does.
No matter how happy your life is around you sometimes it's not enough. Seek medical help ASAP and start living.....................................................
Been there, done that. It works.