I have no further questions except that it interfere with my daily work.

Doctor can help: A variety of signs can be related to depression, such as: feelings of sadness or hopelessness, angry outbursts or irritability, loss of interest in normal activities, sleep disturbances, tiredness or a lack of energy, either weight gain or weight loss due to appetite changes, anxiety or restlessness, slowed thinking, feeling worthless, etc... Seeing one's primary care doctor is a good start.