Bitterness is the combination of anger, disappointment, and resentment.  When life loses its sweetness.  The danger of bitterness is that it is a soul sickness and if not treated we can become incapable of receiving anything good in our lives from God and it will spread. 

Beloved deal with what is dealing with you. Take the Lord to the place that you gave in or up and take His love to be healed today.  He is the cure.