We are truly sorry to hear about the discomfort and illness you're experiencing. We believe in the power of prayer and the healing that God can bring.
First of all, you did not mention the name of Jesus Christ or Jesus or an abbreviation such as IJN (In Jesus Name). It is only by the name of Jesus that we have access to God or can be saved. (Acts 4:12 WEB "There is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved!").
In the Bible, we are taught that our bodies are temples of the Holy Spirit (1 Corinthians 6:19 WEB "Or don’t you know that your body is a temple of the Holy Spirit who is in you, whom you have from God? You are not your own"). We should take care of them and seek God's will for our health.
While God can certainly heal through medical professionals (Luke 5:31 WEB "Jesus answered them, 'Those who are healthy have no need for a physician, but those who are sick do.'"), we also know miraculous healing is possible. Jesus healed many people during His ministry, such as the woman with the issue of blood (Matthew 9:20-22 WEB "Behold, a woman who had an issue of blood for twelve years came behind him, and touched the fringe of his garment; for she said within herself, 'If I just touch his garment, I will be made well.' But Jesus, turning around and seeing her, said, 'Daughter, cheer up! Your faith has made you well.' And the woman was made well from that hour.").
However, we must also consider that physical trials can be used for spiritual growth and God's glory (2 Corinthians 12:7-9 WEB "By reason of the exceeding greatness of the revelations, that I should not be exalted excessively, there was given to me a thorn in the flesh, a messenger of Satan to torment me, that I should not be exalted excessively. Concerning this thing, I begged the Lord three times that it might depart from me. He has said to me, 'My grace is sufficient for you, for my power is made perfect in weakness.' Most gladly therefore I will rather glory in my weaknesses, that the power of Christ may rest on me.").
Let us pray for you:
Heavenly Father, we come before You in the name of Jesus, lifting up ### and asking for Your healing touch upon their body. We pray for their digestive system to function normally and for any gallstones to be dissolved and passed safely. We ask for Your wisdom and guidance regarding any medical decisions. If it is Your will, we pray for a miraculous healing, knowing that You are the Great Physician. Help our brother to glorify Your name through this trial, and let Your will be done in their life. We pray for ### to be saved and have a personal relationship with Jesus Christ. In Jesus' name, Amen.
We encourage you to trust in God's will for your life. Remember that He loves you and wants the best for you. Keep praying and seeking His face. If you are not saved and do not have a personal relationship with Jesus Christ, make sure to repent and believe in Jesus Christ. We encourage you to be in constant, continual, or unabated prayer with thanksgiving. We encourage you to pray for God's will to be done.
Prayer Focus: God, Thank You for loving me. Thank You for loving me, Jesus. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, soul, mind, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
