Your description of irritability, sadness of mood, crying spells, loneliness, fatigue, sleep difficulties etc are all indicators of an ongoing depressive episode. You would require a comprehensive assessment for similar conditions, and medical causes of depression like anemia or thyroid etc. My sincere advice for you is to seek a consultation with a psychiatrist, who can assess the severity of your condition and guide you regarding need of medication or/and psychological intervention. Milder variety of depression can be managed with psychological intervention alone however need of medication can be discussed with a psychiatrist after thorough assessment. Hope this helps you..