I prayed this for several months before the surgery when I was told by doctors they didn't know what my cyst was, that it could be cancer, and they might have to take my ovary out along with the cyst. This prayer helped give me much comfort and peace. I pray it can do the same for you.
Dear Mother of Confidence,
I come before you in my weakness and need trusting in your motherly care, and in the love of God "who has done great things" for you. I give you all my problems, my doubts, and even my sins. And I ask you to give me your own limitless confidence - in the tenderness of God, and in the power of Jesus your Son. Teach me the joy and freedom of abandoning all in His hands. Together with you may I behold God's presence and His power at work in my life. I thank you for leading me to rise above my troubles and cares. Help me to accept all that befalls me with serenity, and to ask for all I need with expectant faith; that I too may be able to see and to say that "He who is mighty has done great things...for me." Amen.
"You cannot learn this from books, you must experience it in your life, that whatever you ask Our Lady she will do.." - Mother Teresa
May God Bless you.