The scripture says in the book of pslam chapter 30 vs 5 - For his anger endureth but a moment; in his favour is life: "weeping may endure for a night, but joy cometh in the morning".
No matter what today may bring for you,the good news is that there is joy coming to you. There is time to weep and there is time to rejoice.
Let us examine the lives of these following people.
Sarah was a woman without a single child,her servant always laughed at her because she gave birth to a child to Abraham.She Sarah always had bitterness of mind,but one day God opened up her womb and she gave birth to Isaac.
Hannah was another woman,who was barren without a child,the second wife always laughed at her too. The bitterness of her heart brought her into God's presence to make her need know to Him.God heard her and gave her a Godly Child(Samuel).
Joseph was another such a person who went through a bitterness journey,but God was with him and brought him to the throne. I cannot mentioned them all, people who went through bitterness of life,but at last joy came across their ways.
Let me tell you my dear,that the bitterness you are going through now is not the end of life,there is a great joy in that bitterness experience which you are currently going through,if only you can stay through.
That bitterness experience cannot last for long time,there is joy awaiting you in it. Have you ever tasted bitter leaf before?You will notice that at first it is very bitter,but at last become sweet. That is how life situation is sometimes.
Just keep on trusting in God and you will see that bitterness experience turning around to joy for you.