Greetings! If you are feeling these negative  emotions and weight loss has been persistent for more than two weeks and is affecting your daily life activities like work or personal relationships then its clinical depression and its  better to consult a psychiatrist online. Other wise if you delay seeking treatment then situation may get worse.

There are certain criteria to see which lasts for for more than 2 weeks to call it a depression. Like feeling sad most of the time, not interested in doing work, sleep and appetite disturbances, negative thoughts of about oneself/future, Irritability, forgetting etc. If you are having majority of these which is hampering your day to day life, then you need to see psychiatrist to rule out possibility of depression. Or it could just be the bad phase of your life lasting few days because of some minor stress.