Greetings. Well, this could be due to stress and unresolved emotional issues which are clouding your mind and pushing you to the brink of falling into Depression. One sees fluctuation of mood and lack of interest and pleasure in previously pleasurable activities, feeling irritable, lack of happiness, getting emotional too often, socially withdrawn from friends and relatives, etc. So I reckon that you need to seek counseling and an anti depressant drug from a Psychiatrist.