You have been happy and you always happy, is it possible to maintain this state even in times of difficulty? How do you cope with this, since life must go on. I understand this is what we go through in life, even though you are so down you are aware that it is just a matter of time before you are yourself again.
If you do not want to go lower than the limit, think about this.
If you try to change a situation you are only trading your happiness. You are responsible for your happiness!
Have a Nice Day,