You feel good because the truth is, depression has no connection to what is happening in your life.
How can you feel like sh*t, depressed one moment, and minutes later you feel "happy as hell"? You didn't get any good news, nothing in your life changed other than some chemicals in your brain/body. Depression is like an entity inside your brain that simply tries to explain away itself with your life situation as to why you should feel depressed and as to why things will never get better etc.
Why would is it so easy to fool countless millions of people that their life circumstances should be an exact reason as to why they are depressed? This is because depression uses your own voice, just as you hear your voice in your head when you are thinking, depression uses that oh so familiar voice of yours and speaks to you with it.
You are then fooled believing that if your voice said that you should be depressed cause "your parents are yelling at you", then it MUST be true, right? Once you come to the realization that depression is just another enitity in your head, using YOUR own voice, then you are able to dismiss it's lies more easily, each and every consecutive time that it speaks to you.
It's hard, but this belief that depression is simply lying to you, that depression has nothing to do with your life situation, allows you to become one step closer to conquering it and living a happy fulfilling life. Hope this made sense. Peace.
If Tetris has taught me anything it's that errors pile up and accomplishments disappear