We are truly sorry to hear about your physical suffering and the challenges you're facing in your friendship. Let's bring these issues before the Lord in prayer and seek His guidance through the Scriptures.
Firstly, we pray for your health. God is our healer, and we believe that He can bring restoration to your body. As it is written in Psalm 103:2-3, "Bless Yahweh, my soul, Don't forget all his benefits, who forgives all your iniquities, who heals all your diseases." We pray that the medicines you've been given will be effective and that God will miraculously heal your sore throat, cough, and chest pain.
Now, regarding your friendship, we must remember that God calls us to love one another, as written in John 13:34, "A new commandment I give to you, that you love one another. Just as I have loved you, you also should love one another." It's disheartening to hear that your friend is treating you poorly and speaking behind your back. We pray that God will soften her heart and convict her to treat you with kindness and respect.
However, we must also remember that God calls us to be lights in the world, as seen in Matthew 5:14-16. "You are the light of the world. A city located on a hill can't be hidden. Neither do you light a lamp, and put it under a measuring basket, but on a stand; and it shines to all who are in the house. Even so, let your light shine before men; that they may see your good works, and glorify your Father who is in heaven." Instead of focusing on what she's doing wrong or praying for her to change, we recommend having a conversation with her and asking in the name of Jesus Christ. You should address the issues and tell her exactly what it is that is hurting you. We also recommend asking her if there is anything you have done to her to ask for her forgiveness. This is an opportunity for you to show her the love of Christ instead of bitterness. Ask her for forgiveness if you have done anything to her and have a discussion about your friendship and how you can grow closer. If she is uninterested in this discussion or does not want to resolve the issues, it may be wise to forgive her and move on. Forgiveness does not mean you are agreeing with her behavior, but it does mean you are letting the bitterness go and allowing God to handle the situation.
We pray that God will give you the strength to approach her with love and kindness and to forgive her. We pray that God will bless your friendship and draw you closer together if it is according to His will. If she is not responding to this conversation, prayer, and dialogue, then we recommend you move on and look for other friends that you can have a Godly relationship with.
Lastly, we notice that your prayer request does not mention Jesus Christ, Jesus, or Christ. It is only by the name of Jesus that we have access to God. The Bible states in John 14:6. "Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me." We encourage you to learn more about Jesus Christ and the plan of salvation.
Let's pray:
Dear Heavenly Father,
We come before You in the name of Jesus, asking for Your healing touch upon our friend's body. Lord, alleviate their suffering, and let Your healing power flow through them. We also bring before You their friendship. Lord, we ask that You would convict their friend's heart and help them to treat our friend with kindness and respect. Help them to have a conversation and move forward through forgiveness according to Your will. We pray for a stronger friendship bond if it is according to Your will. And Lord, we ask that You would reveal Yourself to our friend and draw them closer to You. We ask all these things in Jesus' name. We ask that you will help them forgive their friend and move forward with the peace that He gives.
Amen.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
