The loneliness of loss can be one of the most painful of the emotions you will feel during the grieving process. I know for myself and for my Dad, after the loss of our spouse the evenings are particularly a lonely time because it’s the end of the day and the time you usually settled in for dinner and an evening with your spouse. You might want to find something to do once or twice a week to break up the evening loneliness even if it is dinner at a friends or and evening playing cards with a local group.
Divorced people suffer the loneliness of loss just as much as a death, because it is a death or sorts. The end of a marriage can signify a great loss for many people and that feeling of loss, loneliness and despair are the same.
I encourage you to seek comfort from friends, family and if you are religious from your church.