Emotional

Getting emotional these days ......
Originally very happy but in a minute I feel very depressed ....
Just like suffering from mania .....

Thinking of the reason to this for 2 days ... not really have a clue ....
Maybe bec of biological reason or maybe bec of work stress or maybe both ....

I really hate myself getting emotional as this would greatly affect my working incentive and efficiency .... I cannot concentrate when working and cannot think rationally .... this would affect my co-workers and my clients too ..... GOD .......
What can I do ????? Can someone help ?????
Maybe I really need a rest ........