Anything is possible with God. He created the universe and the earth and all that is in it. He created you. He is all powerful and almighty. Yes, divine healing is possible. The scriptures are filled with examples. A prophet spoke and a king was healed or dying person was restored. Jesus spoke a word and paralyzed people walked, the dead even came back to life. He is the same God today as he was 2,000 and 4,000 years ago, exactly the same.
That is not to say there is a time and place for doctors and He has blessed many with great skill. If you break you arm, it's probably wise to have a doctor treat it. If you have a gaping wound, best to get to a doctor to sew it up! But even the doctor is limited in options and treatments. Our God is not. And ultimately we live and breathe by His grace alone.
Father,
I ask You to give wisdom and guidance to this ailing soul. Help them to draw near to You and understand how mighty and powerful and loving You are. Show them each step to take and help them to honor You in all they do. And I do ask for their complete healing, according to Your will. But I pray they will surrender their life to You just as they are and rejoice in knowing You, exactly where they are today. In Jesus' Name, Amen.