You need time alone to grieve your loss, but when you feel yourself isolating from the body of believers God has placed around you, reach out to someone who can be a good listener or an encourager.
Think about times where God has been faithful to you and renewed you despite your lack of faith. Write them in a journal entry or talk about them with a good friend.
If this loss was not your spouse, be sure to make your marriage a priority. Don’t neglect the very person God may use to comfort you in this time of loss.
Journal your thoughts and prayers. Not only is that a great way of processing what is going on, but it will also allow you to look back and see God’s healing and grace.