Hello dear, Depression can lead a person to fell all of what you have described here. Low mood, fatigue, poor concentration,easy irritability and annoyance, felling stressed etc are all common symptoms of depression. Depression like any other medical illness will require treatment by a specialist doctor, in your case a psychiatrist. Depression is a common and treatable condition. Hence my suggestion for you is to seek a consultation with a psychiatrist near you for comprehensive assessment and management of your condition.... Do not hesitate, do not delay.. As you have taken the first step by seeking answers here, please take the next step by seeking a in person, face to face consultation with a psychiatrist... Hope this helps you.. Best wishes for your health and future... Warm regards.. Delhi Mind Clinic..